diff --git a/lua/Trans/core/backend.lua b/lua/Trans/core/backend.lua
index 6a7e2cb..e323f72 100644
--- a/lua/Trans/core/backend.lua
+++ b/lua/Trans/core/backend.lua
@@ -1,11 +1,16 @@
 local Trans = require('Trans')
-local conf = Trans.conf
 
+
+---@class TransBackend
+---@field query fun(TransData): TransResult
+---@field opts TransBackendOpts
+
+
+local conf = Trans.conf
 --- INFO :Parse online engine keys config file
 local path = conf.dir .. '/Trans.json'
 local file = io.open(path, "r")
 
-
 local result = {}
 if file then
     local content = file:read("*a")
@@ -13,16 +18,32 @@ if file then
     file:close()
 end
 
+
+local default_opts = conf.backend.default
+default_opts.__index = default_opts
+
+
+---@class Trans
+---@field backend table<string, TransBackend>
 return setmetatable({}, {
     __index = function(self, name)
-        local opts = vim.tbl_extend('keep', conf.backend[name] or {}, conf.backend.default, result[name] or {})
+        ---@type TransBackend
         local backend = require('Trans.backend.' .. name)
-
-        for k, v in pairs(opts) do
-            backend[k] = v
+        if backend then
+            self[name] = backend
+        else
+            backend = self[name]
+        end
+
+        backend.opts = setmetatable(conf.backend[name] or {}, default_opts)
+
+        local private_opts = result[name]
+        if private_opts then
+            for k, v in pairs(private_opts) do
+                backend[k] = v
+            end
         end
 
-        self[name] = backend
         return backend
     end
 })
diff --git a/lua/Trans/core/buffer.lua b/lua/Trans/core/buffer.lua
index f85fd9c..16248b9 100644
--- a/lua/Trans/core/buffer.lua
+++ b/lua/Trans/core/buffer.lua
@@ -1,17 +1,16 @@
----@class buf
----@field bufnr integer buffer handle
-
----@type buf
-local buffer = {}
-
 local api, fn = vim.api, vim.fn
 
+---@class TransBuffer
+---@field bufnr integer buffer handle
+---@field [number] string buffer[line] content
+local buffer = {}
+
 ---Clear all content in buffer
 function buffer:wipe()
     api.nvim_buf_set_lines(self.bufnr, 0, -1, false, {})
 end
 
----delete buffer [_start, _end] line content [one index]
+---Delete buffer [_start, _end] line content [one index]
 ---@param _start integer start line index
 ---@param _end integer end line index
 function buffer:del(_start, _end)
@@ -30,7 +29,7 @@ function buffer:set(name, value)
     api.nvim_buf_set_option(self.bufnr, name, value)
 end
 
----get buffer option
+---Get buffer option
 ---@param name string option name
 ---@return any
 function buffer:option(name)
@@ -42,7 +41,6 @@ function buffer:destroy()
     api.nvim_buf_delete(self.bufnr, { force = true })
 end
 
-
 ---Set buffer load keymap
 ---@param key string
 ---@param operation function | string
@@ -53,7 +51,7 @@ function buffer:map(key, operation)
     })
 end
 
----Execute normal keycode in this buffer[no recursive]
+---Execute keycode in normal this buffer[no recursive]
 ---@param key string key code
 function buffer:normal(key)
     api.nvim_buf_call(self.bufnr, function()
@@ -61,8 +59,8 @@ function buffer:normal(key)
     end)
 end
 
----@return boolean
 ---@nodiscard
+---@return boolean
 function buffer:is_valid()
     return api.nvim_buf_is_valid(self.bufnr)
 end
@@ -161,7 +159,6 @@ function buffer:setline(nodes, one_index)
     self:set('modifiable', false)
 end
 
----@private
 buffer.__index = function(self, key)
     local res = buffer[key]
     if res then
@@ -169,14 +166,12 @@ buffer.__index = function(self, key)
     elseif type(key) == 'number' then
         -- return fn.getbufoneline(self.bufnr, key) -- Vimscript Function Or Lua API ??
         return api.nvim_buf_get_lines(self.bufnr, key - 1, key, true)[1]
-
     else
         error('invalid key: ' .. key)
     end
 end
 
 
----@private
 buffer.__newindex = function(self, key, nodes)
     if type(key) == 'number' then
         self:setline(nodes, key)
@@ -185,12 +180,13 @@ buffer.__newindex = function(self, key, nodes)
     end
 end
 
----buffer constructor
----@return buf
+
+---@nodiscard
+---TransBuffer constructor
+---@return TransBuffer
 function buffer.new()
     local new_buf = setmetatable({
         bufnr = api.nvim_create_buf(false, false),
-        extmarks = {},
     }, buffer)
 
     new_buf:set('modifiable', false)
@@ -199,4 +195,6 @@ function buffer.new()
     return new_buf
 end
 
+---@class Trans
+---@field buffer TransBuffer
 return buffer
diff --git a/lua/Trans/core/conf.lua b/lua/Trans/core/conf.lua
index a7ebf8f..d6dc4dc 100644
--- a/lua/Trans/core/conf.lua
+++ b/lua/Trans/core/conf.lua
@@ -7,34 +7,58 @@ if vim.fn.has('nvim-0.9') == 1 then
     }
 end
 
+
+---@class Trans
+---@field conf TransConf
+
+
+---@class TransConf
 return {
+    ---@type string the directory for database file and password file
     dir      = os.getenv('HOME') .. '/.vim/dict',
+    ---@type table modeStrategy default strategy for mode
     strategy = {
+        ---@type { frontend:string, backend:string } fallback strategy for mode
         default = {
             frontend = 'hover',
             backend = '*',
         },
     },
+    ---@type table<string, TransBackendOpts> fallback backend for mode
     backend  = {
+        ---@class TransBackendOpts
         default = {
+            ---@type integer timeout for backend send request
             timeout = 2000,
         },
     },
+    ---@type table frontend options
     frontend = {
+        ---@class TransFrontendOpts
+        ---@field keymaps table<string, string>
         default = {
+            ---@type boolean Whether to auto play the audio
             auto_play = true,
             border = 'rounded',
+            title = title, -- need nvim-0.9
+            ---@type {open: string | boolean, close: string | boolean, interval: integer} Hover Window Animation
             animation = {
                 open = 'slid', -- 'fold', 'slid'
                 close = 'slid',
                 interval = 12,
             },
-            title = title, -- need nvim-0.9
         },
+        ---@class HoverOptions : TransFrontendOpts
         hover = {
+            ---@type integer Max Width of Hover Window
             width             = 37,
+            ---@type integer Max Height of Hover Window
             height            = 27,
-            keymap            = {
+            ---@type string -- see: /lua/Trans/style/spinner
+            spinner           = 'dots',
+            ---@type string -- TODO :support replace with {{special word}}
+            fallback_message  = '翻译超时或没有找到相关的翻译',
+            keymaps           = {
                 play         = '_',
                 pageup       = '[[',
                 pagedown     = ']]',
@@ -42,11 +66,13 @@ return {
                 close        = '<leader>]',
                 toggle_entry = '<leader>;',
             },
+            ---@type string[] auto close events
             auto_close_events = {
                 'InsertEnter',
                 'CursorMoved',
                 'BufLeave',
             },
+            ---@type string[] order to display translate result
             order             = {
                 'title',
                 'tag',
@@ -55,8 +81,7 @@ return {
                 'translation',
                 'definition',
             },
-            spinner           = 'dots',          -- see: /lua/Trans/style/spinner
-            fallback_message  = '翻译超时或没有找到相关的翻译', -- TODO :support replace with {{special word}}
+            ---@type table<string, string>
             icon              = {
                 -- or use emoji
                 star     = '', -- ⭐
@@ -68,7 +93,7 @@ return {
         },
     },
     style    = {
-        -- see lua/Trans/style/theme.lua
+        ---@type string global Trans theme [see lua/Trans/style/theme.lua]
         theme = 'default', -- default | tokyonight | dracula
     },
 }
diff --git a/lua/Trans/core/curl.lua b/lua/Trans/core/curl.lua
index be91429..a475ad1 100644
--- a/lua/Trans/core/curl.lua
+++ b/lua/Trans/core/curl.lua
@@ -1,6 +1,25 @@
+---@class TransCurl
 local curl = {}
 
-curl.get = function(uri, opts)
+---@class RequestResult
+---@field body string
+---@field exit integer exit code
+---@field error string error message from stderr
+
+
+---@class TransCurlOptions
+---@field query table<string, string> query arguments
+---@field output string output file path
+---@field headers table<string, string> headers
+---@field callback fun(result: RequestResult)
+
+
+---@async
+---Send a GET request use curl
+---@param uri string uri for request
+---@param opts
+---| { query?: table<string, string>, output?: string, headers?: table<string, string>, callback: fun(result: RequestResult) }
+function curl.get(uri, opts)
     local query    = opts.query
     local output   = opts.output
     local headers  = opts.headers
@@ -49,13 +68,11 @@ curl.get = function(uri, opts)
     end
 
     local on_exit = function(_, exit)
-        if callback then
-            callback {
-                exit = exit,
-                body = table.concat(outputs),
-                error = error
-            }
-        end
+        callback {
+            exit = exit,
+            body = table.concat(outputs),
+            error = table.concat(error, '\n')
+        }
     end
 
     -- vim.pretty_print(table.concat(cmd, ' '))
@@ -67,10 +84,12 @@ curl.get = function(uri, opts)
     })
 end
 
-
----- TODO :
+--- TODO :
 -- curl.post = function ()
 --
 -- end
 
+
+---@class Trans
+---@field curl TransCurl
 return curl
diff --git a/lua/Trans/core/data.lua b/lua/Trans/core/data.lua
index e6e3cc1..5a5bd83 100644
--- a/lua/Trans/core/data.lua
+++ b/lua/Trans/core/data.lua
@@ -1,42 +1,42 @@
 local Trans = require('Trans')
 
+
+---@class TransData
+---@field from string @Source language type
+---@field to string @Target language type
+---@field is_word boolean @Is the str a word
+---@field str string @The original string
+---@field mode string @The mode of the str
+---@field result table<string, TransResult> @The result of the translation
+---@field frontend TransFrontend
+---@field backends table<string, TransBackend>
 local M = {}
 M.__index = M
 
----@class data
----@field str string
----@field mode string
----@field result table
----@field frontend table
----@field backend table
----@field from string
----@field to string
----@field is_word boolean
-
-
----Data constructor
+---TransData constructor
 ---@param opts table
----@return data
+---@return TransData
 function M.new(opts)
     local mode = opts.mode
     local str  = opts.str
 
 
     local strategy = Trans.conf.strategy[mode]
-    local data     = {
+
+
+    local data = setmetatable({
         str    = str,
         mode   = mode,
         result = {},
-    }
+    }, M)
 
-    data.frontend  = Trans.frontend[strategy.frontend].new()
 
-    data.backend   = {}
+    data.frontend = Trans.frontend[strategy.frontend].new()
+    data.backends = {}
     for i, name in ipairs(strategy.backend) do
-        data.backend[i] = Trans.backend[name]
+        data.backends[i] = Trans.backend[name]
     end
 
-
     if Trans.util.is_English(str) then
         data.from = 'en'
         data.to = 'zh'
@@ -48,14 +48,23 @@ function M.new(opts)
     -- FIXME : Check if the str is a word
     data.is_word = true
 
-    return setmetatable(data, M)
+    return data
 end
 
+---@class TransResult
+---@field title table | string @table: {word, phonetic, oxford, collins}
+---@field tag string[]? @array of tags
+---@field pos table<string, string>? @table: {name, value}
+---@field exchange table<string, string>? @table: {name, value}
+---@field definition? string[]? @array of definitions
+---@field translation? string[]? @array of translations
+
+
 ---Get the first available result [return nil if no result]
----@return table?
+---@return TransResult?
 function M:get_available_result()
     local result = self.result
-    local backend = self.backend
+    local backend = self.backends
 
     for _, name in ipairs(backend) do
         if result[name] then
@@ -64,4 +73,6 @@ function M:get_available_result()
     end
 end
 
+---@class Trans
+---@field data TransData
 return M
diff --git a/lua/Trans/core/define.lua b/lua/Trans/core/define.lua
index 0110336..540ed0b 100644
--- a/lua/Trans/core/define.lua
+++ b/lua/Trans/core/define.lua
@@ -1,4 +1,9 @@
+---@class Trans
+---@field define TransDefine
+
+---@class TransDefine
 return {
+    ---@type TransMode[]
     modes = {
         'normal',
         'visual',
diff --git a/lua/Trans/core/frontend.lua b/lua/Trans/core/frontend.lua
index e53c35a..cb8a83b 100644
--- a/lua/Trans/core/frontend.lua
+++ b/lua/Trans/core/frontend.lua
@@ -3,16 +3,18 @@ local conf = Trans.conf
 local frontend_opts = conf.frontend
 
 
+---Setup frontend Keymaps
+---@param frontend TransFrontend
 local function set_frontend_keymap(frontend)
     local set = vim.keymap.set
-    local keymap_opts = { silent = true, expr = true }
+    local keymap_opts = { silent = true, expr = false, }
 
-    for action, key in pairs(frontend.opts.keymap) do
+    for action, key in pairs(frontend.opts.keymaps) do
         set('n', key, function()
             local instance = frontend.get_active_instance()
 
             if instance then
-                instance:execute(action)
+                coroutine.wrap(instance.execute)(instance, action)
             else
                 return key
             end
@@ -21,11 +23,21 @@ local function set_frontend_keymap(frontend)
 end
 
 
-local M = setmetatable({}, {
+---@class TransFrontend
+---@field opts TransFrontendOpts
+---@field get_active_instance fun():TransFrontend?
+---@field process fun(data: TransData, result: TransResult)
+---@field wait fun(self: TransFrontend, result: TransResult, name: string, timeout: integer)
+---@field execute fun(action: string) @Execute action for frontend instance
+
+---@class Trans
+---@field frontend TransFrontend
+return setmetatable({}, {
     __index = function(self, name)
         local opts = vim.tbl_extend('keep', frontend_opts[name] or {}, frontend_opts.default)
-        local frontend = require('Trans.frontend.' .. name)
 
+        ---@type TransFrontend
+        local frontend = require('Trans.frontend.' .. name)
 
         frontend.opts = opts
         self[name] = frontend
@@ -35,7 +47,3 @@ local M = setmetatable({}, {
         return frontend
     end
 })
-
-
-
-return M
diff --git a/lua/Trans/core/install.lua b/lua/Trans/core/install.lua
index ea01db3..ccce316 100644
--- a/lua/Trans/core/install.lua
+++ b/lua/Trans/core/install.lua
@@ -1,10 +1,13 @@
+---@class Trans
+---@field install fun() Download database and tts dependencies
 return function()
     local Trans = require('Trans')
     -- INFO :Check ultimate.db exists
     local dir = Trans.conf.dir
     local path = dir .. '/ultimate.db'
+    local fn = vim.fn
 
-    if vim.fn.filereadable(path) == 1 then
+    if fn.filereadable(path) == 1 then
         vim.notify('Database already exists', vim.log.WARN)
         return
     else
@@ -16,8 +19,8 @@ return function()
     local uri = 'https://github.com/skywind3000/ECDICT-ultimate/releases/download/1.0.0/ecdict-ultimate-sqlite.zip'
     local loc = dir .. '/ultimate.zip'
     local handle = function(output)
-        if output.exit == 0 and vim.fn.filereadable(loc) then
-            if vim.fn.executable('unzip') == 0 then
+        if output.exit == 0 and fn.filereadable(loc) then
+            if fn.executable('unzip') == 0 then
                 vim.notify('unzip not found, Please unzip ' .. loc .. 'manually', vim.log.ERROR)
                 return
             end
@@ -42,7 +45,7 @@ return function()
     })
 
     -- INFO : Install tts dependencies
-    if vim.fn.has('linux') == 0 and vim.fn.has('mac') == 0 then
+    if fn.has('linux') == 0 and fn.has('mac') == 0 then
         os.execute('cd ./tts/ && npm install')
     end
 end
diff --git a/lua/Trans/core/setup.lua b/lua/Trans/core/setup.lua
index 4333ab1..6b2a7a8 100644
--- a/lua/Trans/core/setup.lua
+++ b/lua/Trans/core/setup.lua
@@ -58,7 +58,6 @@ local function set_frontend_opts(conf)
 end
 
 
-
 local function define_highlights(conf)
     local set_hl     = vim.api.nvim_set_hl
     local highlights = Trans.style.theme[conf.style.theme]
@@ -68,7 +67,12 @@ local function define_highlights(conf)
 end
 
 
-
+---@alias TransMode
+---|'normal' # Normal mode
+---|'visual' # Visual mode
+---|'input' # Input mode
+---@class Trans
+---@field setup fun(opts: { mode: string, mode: TransMode })
 return function(opts)
     if opts then
         Trans.conf = vim.tbl_deep_extend('force', Trans.conf, opts)
diff --git a/lua/Trans/core/translate.lua b/lua/Trans/core/translate.lua
index 1e55121..b55e8f1 100644
--- a/lua/Trans/core/translate.lua
+++ b/lua/Trans/core/translate.lua
@@ -1,9 +1,9 @@
 local Trans = require('Trans')
 local util = Trans.util
 
-
 local function init_opts(opts)
     opts = opts or {}
+    ---@type TransMode
     opts.mode = opts.mode or ({
         n = 'normal',
         v = 'visual',
@@ -14,11 +14,14 @@ local function init_opts(opts)
 end
 
 
+---To Query All Backends
+---@param data TransData
+---@return TransResult? @return nil if no result
 local function do_query(data)
     -- HACK :Rewrite this function to support multi requests
     local frontend = data.frontend
     local result = data.result
-    for _, backend in ipairs(data.backend) do
+    for _, backend in ipairs(data.backends) do
         local name = backend.name
         if backend.no_wait then
             backend.query(data)
@@ -39,7 +42,6 @@ end
 
 -- HACK : Core process logic
 local function process(opts)
-    Trans.translate = coroutine.wrap(process)
     opts = init_opts(opts)
     local str = opts.str
     if not str or str == '' then return end
@@ -64,4 +66,9 @@ local function process(opts)
     data.frontend:process(data, result)
 end
 
-return coroutine.wrap(process)
+
+---@class Trans
+---@field translate fun(opts: { word: string, mode: string?}) Translate string core function
+return function(opts)
+    coroutine.wrap(process)(opts)
+end
diff --git a/lua/Trans/core/util.lua b/lua/Trans/core/util.lua
index 84702ab..f26df32 100644
--- a/lua/Trans/core/util.lua
+++ b/lua/Trans/core/util.lua
@@ -1,7 +1,15 @@
-M = require('Trans').metatable('util')
+---@class Trans
+---@field util TransUtil
+local Trans = require('Trans')
 
 local fn, api = vim.fn, vim.api
 
+---@class TransUtil
+local M = require('Trans').metatable('util')
+
+
+---Get selected text
+---@return string
 function M.get_select()
     local _start = fn.getpos("v")
     local _end = fn.getpos('.')
@@ -33,7 +41,7 @@ function M.get_select()
 end
 
 ---Get Text which need to be translated
----@param mode string 'n' | 'v' | 'i'
+---@param mode TransMode
 ---@return string
 function M.get_str(mode)
     if mode == 'n' or mode == 'normal' then
@@ -48,9 +56,8 @@ function M.get_str(mode)
     end
 end
 
-
 ---Puase coroutine for {ms} milliseconds
----@param ms integer milliseconds
+---@param ms integer
 function M.pause(ms)
     local co = coroutine.running()
     vim.defer_fn(function()
@@ -59,9 +66,8 @@ function M.pause(ms)
     coroutine.yield()
 end
 
-
 ---Detect whether the string is English
----@param str string string to detect
+---@param str string
 ---@return boolean
 function M.is_English(str)
     local char = { str:byte(1, -1) }
@@ -73,4 +79,4 @@ function M.is_English(str)
     return true
 end
 
-return M
+Trans.util = M
diff --git a/lua/Trans/core/window.lua b/lua/Trans/core/window.lua
index 9acdea9..2227ba0 100644
--- a/lua/Trans/core/window.lua
+++ b/lua/Trans/core/window.lua
@@ -1,18 +1,11 @@
 local api = vim.api
 local Trans = require("Trans")
 
-
----@class win
----@field win_opts table window config [**When open**]
----@field winid integer window handle
----@field ns integer namespace for highlight
----@field animation table window animation
----@field enter boolean cursor should [enter] window when open
----@field buffer buffer attached buffer object
+---@class TransWindow
 local window = {}
 
 ---Change window attached buffer
----@param buf buf
+---@param buf TransBuffer
 function window:set_buf(buf)
     api.nvim_win_set_buf(self.winid, buf.bufnr)
     self.buf = buf
@@ -25,11 +18,11 @@ function window:is_valid()
 end
 
 ---Set window option
----@param option string option name
+---@param name string option name
 ---@param value any
-function window:set(option, value)
+function window:set(name, value)
     if self:is_valid() then
-        api.nvim_win_set_option(self.winid, option, value)
+        api.nvim_win_set_option(self.winid, name, value)
     end
 end
 
@@ -50,19 +43,25 @@ function window:set_width(width)
 end
 
 ---Get window width
+---@return integer
 function window:width()
     return api.nvim_win_get_width(self.winid)
 end
 
 ---Get window height
+---@return integer
 function window:height()
     return api.nvim_win_get_height(self.winid)
 end
 
+-- TODO :
+-- function window:adjust()
+
+-- end
+
 ---Expand window [width | height] value
----@param opts table
----|'field'string [width | height]
----|'target'integer
+---@param opts
+---|{ field: string, to: integer}
 function window:smooth_expand(opts)
     local field = opts.field -- width | height
     local from  = api['nvim_win_get_' .. field](self.winid)
@@ -76,18 +75,19 @@ function window:smooth_expand(opts)
 
 
     local wrap = self:option('wrap')
-
     local interval = self.animation.interval
     for i = from + 1, to, (from < to and 1 or -1) do
         self:set('wrap', false)
         method(self.winid, i)
         pause(interval)
     end
-
     self:set('wrap', wrap)
 end
 
-function M:resize(opts)
+---Resize window
+---@param opts
+---|{ width: integer, height: integer }
+function window:resize(opts)
     local width = opts[1]
     local height = opts[2]
 
@@ -126,9 +126,9 @@ function window:try_close()
     api.nvim_win_close(self.winid, true)
 end
 
----set window local highlight group
+---Set window local highlight group
 ---@param name string
----@param opts table
+---@param opts table highlight config
 function window:set_hl(name, opts)
     api.nvim_set_hl(self.ns, name, opts)
 end
@@ -155,20 +155,22 @@ function window:open()
     end
 end
 
-
-function window:center(node)
-    -- TODO :
-    print('TODO Center')
-    -- local text = node[1]
-    -- local width = text:width()
-    -- local win_width = self.width
-    -- local space = math.max(math.floor((win_width - width) / 2), 0)
-    -- node[1] = (' '):rep(space) .. text
-    -- return node
-end
+-- function window:center(node)
+--     -- TODO :
+--     print('TODO Center')
+--     -- local text = node[1]
+--     -- local width = text:width()
+--     -- local win_width = self.width
+--     -- local space = math.max(math.floor((win_width - width) / 2), 0)
+--     -- node[1] = (' '):rep(space) .. text
+--     -- return node
+-- end
 
 window.__index = window
 
+
+
+---@class TransWindowOpts
 local default_opts = {
     enter    = false,
     winid    = -1,
@@ -180,23 +182,33 @@ local default_opts = {
     },
 }
 
+---@class TransWindow
+---@field buffer TransBuffer attached buffer object
+---@field win_opts table window config [**When open**]
+---@field private winid integer window handle
+---@field ns integer namespace for highlight
+---@field enter boolean cursor should [enter] window when open
+---@field animation
+---|{open: string | boolean, close: string | boolean, interval: integer} Hover Window Animation
+
 
 ---Create new window
----@param opts table window config
----@return win
+---@param opts TransWindowOpts window config
+---@return TransWindow
 function window.new(opts)
     opts = vim.tbl_deep_extend('keep', opts, default_opts)
 
     local win = setmetatable(opts, window)
+    ---@cast win TransWindow
+
     win:open()
     return win
 end
 
+---@class Trans
+---@field window TransWindow
 return window
-
 -- local win_opt   = {
---     focusable = false,
---     style     = 'minimal',
 --     zindex    = zindex,
 --     width     = width,
 --     height    = height,
@@ -206,25 +218,3 @@ return window
 --     title     = title,
 --     relative  = relative,
 -- }
-
--- if field then
---     win_opt[field] = 1
--- end
-
--- if win_opt.title then
---     win_opt.title_pos = 'center'
--- end
-
--- local win = setmetatable({
---     buf       = buf,
---     ns        = ns,
---     height    = win_opt.height,
---     width     = win_opt.width,
---     animation = animation,
---     winid     = api.nvim_open_win(buf.bufnr, enter, win_opt),
--- }, window)
-
--- return win, win:expand {
---     field = field,
---     target = opts[field],
--- }
diff --git a/lua/Trans/frontend/hover/execute.lua b/lua/Trans/frontend/hover/execute.lua
index b6bd2d7..c0c1f54 100644
--- a/lua/Trans/frontend/hover/execute.lua
+++ b/lua/Trans/frontend/hover/execute.lua
@@ -20,8 +20,7 @@ local strategy = {
 }
 
 
-
 return function(hover, action)
     -- TODO :
-    coroutine.wrap(strategy[action])(hover)
+    strategy[action](hover)
 end
diff --git a/lua/Trans/frontend/hover/init.lua b/lua/Trans/frontend/hover/init.lua
index 12c9d30..0168700 100644
--- a/lua/Trans/frontend/hover/init.lua
+++ b/lua/Trans/frontend/hover/init.lua
@@ -1,10 +1,10 @@
 local Trans = require('Trans')
 
 ---@class hover
----@field queue table @hover queue for all hover instances
----@field buffer buf @buffer for hover window
+---@field buffer TransBuffer @buffer for hover window
+---@field window TransWindow @hover window
+---@field queue hover[] @hover queue for all hover instances
 ---@field destroy_funcs table @functions to be executed when hover window is closed
----@field window window @hover window
 ---@field opts table @options for hover window
 ---@field opts.title string @title for hover window
 ---@field opts.width number @width for hover window
@@ -18,8 +18,6 @@ local Trans = require('Trans')
 ---@field opts.icon.no string @icon for no
 ---@field opts.icon.star string @icon for star
 ---@field opts.icon.cell string @icon for cell used in waitting animation
-
-
 local M = Trans.metatable('frontend.hover', {
     ns    = vim.api.nvim_create_namespace('TransHoverWin'),
     queue = {},
@@ -67,7 +65,6 @@ function M:destroy()
     if self.buffer:is_valid() then self.buffer:destroy() end
 end
 
-
 ---Init hover window
 ---@param opts table? @window options: width, height
 ---@return unknown
diff --git a/lua/Trans/health.lua b/lua/Trans/health.lua
index 2ad3350..ad06449 100644
--- a/lua/Trans/health.lua
+++ b/lua/Trans/health.lua
@@ -31,7 +31,6 @@ local function check_plugin_dependencies()
     end
 end
 
-
 local function check_binary_dependencies()
     local binary_dependencies = {
         'curl',
diff --git a/lua/Trans/init.lua b/lua/Trans/init.lua
index db79277..d3a9980 100644
--- a/lua/Trans/init.lua
+++ b/lua/Trans/init.lua
@@ -1,13 +1,11 @@
 ---Set or Get metatable which will find module in folder
 ---@param folder_name string
----@param origin table?
+---@param origin table? table to be set metatable
 ---@return table
 local function metatable(folder_name, origin)
     return setmetatable(origin or {}, {
         __index = function(tbl, key)
-            local status, result = pcall(require, ('Trans.%s.%s'):format(folder_name, key))
-            if not status then return end
-
+            local result = require(('Trans.%s.%s'):format(folder_name, key))
             tbl[key] = result
             return result
         end
@@ -15,11 +13,19 @@ local function metatable(folder_name, origin)
 end
 
 
-local M     = metatable('core')
+---@class string
+---@field width function @Get string display width
+---@field play function @Use tts to play string
+
+
+---@class Trans
+---@field style table @Style module
+---@field cache table<string, TransData> @Cache for translated data object
+local M = metatable('core', {
+    style = metatable("style"),
+    cache = {},
+})
 
 M.metatable = metatable
-M.style     = metatable("style")
-
-M.cache     = {}
 
 return M
diff --git a/plugin/Trans.lua b/plugin/Trans.lua
index f858228..6cf5eaf 100644
--- a/plugin/Trans.lua
+++ b/plugin/Trans.lua
@@ -1,5 +1,6 @@
 local api, fn = vim.api, vim.fn
 
+
 string.width = api.nvim_strwidth
 --- INFO :Define string play method
 if fn.has('linux') == 1 then