diff --git a/lua/Trans/core/buffer.lua b/lua/Trans/core/buffer.lua
index 1193681..f85fd9c 100644
--- a/lua/Trans/core/buffer.lua
+++ b/lua/Trans/core/buffer.lua
@@ -1,5 +1,7 @@
 ---@class buf
 ---@field bufnr integer buffer handle
+
+---@type buf
 local buffer = {}
 
 local api, fn = vim.api, vim.fn
@@ -36,10 +38,11 @@ function buffer:option(name)
 end
 
 ---Destory buffer
-function buffer:destory()
+function buffer:destroy()
     api.nvim_buf_delete(self.bufnr, { force = true })
 end
 
+
 ---Set buffer load keymap
 ---@param key string
 ---@param operation function | string
@@ -166,8 +169,9 @@ 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)
+        error('invalid key: ' .. key)
     end
 end
 
diff --git a/lua/Trans/core/data.lua b/lua/Trans/core/data.lua
index 7a4078a..e6e3cc1 100644
--- a/lua/Trans/core/data.lua
+++ b/lua/Trans/core/data.lua
@@ -51,17 +51,17 @@ function M.new(opts)
     return setmetatable(data, M)
 end
 
--- ---Get the first available result [return nil if no result]
--- ---@return table?
--- function M:get_available_result()
---     local result = self.result
---     local backend = self.backend
+---Get the first available result [return nil if no result]
+---@return table?
+function M:get_available_result()
+    local result = self.result
+    local backend = self.backend
 
---     for _, name in ipairs(backend) do
---         if result[name] then
---             return result[name]
---         end
---     end
--- end
+    for _, name in ipairs(backend) do
+        if result[name] then
+            return result[name]
+        end
+    end
+end
 
 return M
diff --git a/lua/Trans/core/frontend.lua b/lua/Trans/core/frontend.lua
index f918462..e53c35a 100644
--- a/lua/Trans/core/frontend.lua
+++ b/lua/Trans/core/frontend.lua
@@ -10,6 +10,7 @@ local function set_frontend_keymap(frontend)
     for action, key in pairs(frontend.opts.keymap) do
         set('n', key, function()
             local instance = frontend.get_active_instance()
+
             if instance then
                 instance:execute(action)
             else
diff --git a/lua/Trans/core/translate.lua b/lua/Trans/core/translate.lua
index 53c6df2..1e55121 100644
--- a/lua/Trans/core/translate.lua
+++ b/lua/Trans/core/translate.lua
@@ -47,8 +47,12 @@ local function process(opts)
     -- Find in cache
     if Trans.cache[str] then
         local data = Trans.cache[str]
-        data.frontend:process(data)
-        return
+
+        local result = data:get_available_result()
+        if result then
+            data.frontend:process(data, result)
+            return
+        end
     end
 
 
diff --git a/lua/Trans/core/util.lua b/lua/Trans/core/util.lua
index b82a1c7..84702ab 100644
--- a/lua/Trans/core/util.lua
+++ b/lua/Trans/core/util.lua
@@ -49,6 +49,8 @@ function M.get_str(mode)
 end
 
 
+---Puase coroutine for {ms} milliseconds
+---@param ms integer milliseconds
 function M.pause(ms)
     local co = coroutine.running()
     vim.defer_fn(function()
@@ -57,6 +59,10 @@ function M.pause(ms)
     coroutine.yield()
 end
 
+
+---Detect whether the string is English
+---@param str string string to detect
+---@return boolean
 function M.is_English(str)
     local char = { str:byte(1, -1) }
     for i = 1, #str do
diff --git a/lua/Trans/core/window.lua b/lua/Trans/core/window.lua
index f2fba72..9acdea9 100644
--- a/lua/Trans/core/window.lua
+++ b/lua/Trans/core/window.lua
@@ -54,11 +54,6 @@ function window:width()
     return api.nvim_win_get_width(self.winid)
 end
 
-
-function window:highlight_line(linenr, highlight)
-    self.buffer:highlight_line(linenr, highlight, self.ns)
-end
-
 ---Get window height
 function window:height()
     return api.nvim_win_get_height(self.winid)
@@ -70,8 +65,8 @@ end
 ---|'target'integer
 function window:smooth_expand(opts)
     local field = opts.field -- width | height
-    local from  = self[field](self)
-    local to    = opts.target
+    local from  = api['nvim_win_get_' .. field](self.winid)
+    local to    = opts.to
 
     if from == to then return end
 
@@ -92,6 +87,27 @@ function window:smooth_expand(opts)
     self:set('wrap', wrap)
 end
 
+function M:resize(opts)
+    local width = opts[1]
+    local height = opts[2]
+
+
+    if self:width() ~= width then
+        self:smooth_expand {
+            field = 'width',
+            to = width
+        }
+    end
+
+
+    if self:height() ~= height then
+        self:smooth_expand {
+            field = 'height',
+            to = height
+        }
+    end
+end
+
 ---Try to close window with animation?
 function window:try_close()
     local close_animation = self.animation.close
@@ -103,7 +119,7 @@ function window:try_close()
 
         self:smooth_expand({
             field = field,
-            target = 1,
+            to = 1,
         })
     end
 
@@ -132,23 +148,23 @@ function window:open()
         self.winid = api.nvim_open_win(self.buffer.bufnr, self.enter, win_opts)
         self:smooth_expand({
             field = field,
-            target = to,
+            to = to,
         })
     else
         self.winid = api.nvim_open_win(self.buffer.bufnr, self.enter, win_opts)
     end
 end
 
----buffer:addline() helper function
----@param node table
----@return table node formatted node
+
 function window:center(node)
-    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
+    -- 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
@@ -178,25 +194,6 @@ end
 
 return window
 
--- local ns        = opts.ns
--- local buf       = opts.buf
--- local col       = opts.col
--- local row       = opts.row
--- local title     = opts.title
--- local width     = opts.width
--- local height    = opts.height
--- local border    = opts.border
--- local zindex    = opts.zindex
--- local relative  = opts.relative
--- local animation = opts.animation
-
--- local open      = animation.open
-
--- local field     = ({
---     slid = 'width',
---     fold = 'height',
--- })[open]
-
 -- local win_opt   = {
 --     focusable = false,
 --     style     = 'minimal',
diff --git a/lua/Trans/frontend/hover/execute.lua b/lua/Trans/frontend/hover/execute.lua
index 6f5a30f..b6bd2d7 100644
--- a/lua/Trans/frontend/hover/execute.lua
+++ b/lua/Trans/frontend/hover/execute.lua
@@ -1,5 +1,5 @@
 local strategy = {
-    play = function(self)
+    play = function()
         print('TODO: play')
     end,
     pageup = function()
@@ -11,8 +11,8 @@ local strategy = {
     pin = function()
         print('TODO: pin')
     end,
-    close = function()
-        print('TODO: close')
+    close = function(hover)
+        hover:destroy()
     end,
     toggle_entry = function()
         print('TODO: toggle_entry')
@@ -21,7 +21,7 @@ local strategy = {
 
 
 
-return function(self, action)
+return function(hover, action)
     -- TODO :
-    strategy[action](self)
+    coroutine.wrap(strategy[action])(hover)
 end
diff --git a/lua/Trans/frontend/hover/init.lua b/lua/Trans/frontend/hover/init.lua
index 3e49e7f..12c9d30 100644
--- a/lua/Trans/frontend/hover/init.lua
+++ b/lua/Trans/frontend/hover/init.lua
@@ -2,7 +2,7 @@ local Trans = require('Trans')
 
 ---@class hover
 ---@field queue table @hover queue for all hover instances
----@field buffer buffer @buffer for hover window
+---@field buffer buf @buffer for hover window
 ---@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
@@ -62,10 +62,12 @@ function M:destroy()
         func(self)
     end
 
-    self.window:try_close()
-    self.buffer:destroy()
+
+    if self.window:is_valid() then self.window:try_close() end
+    if self.buffer:is_valid() then self.buffer:destroy() end
 end
 
+
 ---Init hover window
 ---@param opts table? @window options: width, height
 ---@return unknown
@@ -127,9 +129,8 @@ function M:wait(tbl, name, timeout)
         pause(interval)
     end
 
-    buffer[1] = ''
-
     -- TODO : End waitting animation
+    buffer[1] = ''
 end
 
 function M:process(_, result)
@@ -145,18 +146,10 @@ function M:process(_, result)
     end
 
     local win = self.window
-    if not win then
+    if win and win:is_valid() then
+        win:resize { self.opts.width, self.opts.height }
+    else
         win = self:init_window()
-    elseif win:width() ~= opts.width then
-        win:expand {
-            field = 'width',
-            to = opts.width
-        }
-    elseif win:height() ~= opts.height then
-        win:expand {
-            field = 'height',
-            to = opts.height
-        }
     end
 
     win:set('wrap', true)
@@ -169,17 +162,6 @@ function M:is_available()
 end
 
 return M
--- local function handle_keymap(win, word)
---     local keymap = hover.keymap
---     local cur_buf = api.nvim_get_current_buf()
---     local del = vim.keymap.del
---     local function try_del_keymap()
---         for _, key in pairs(keymap) do
---             pcall(del, 'n', key)
---         end
---     end
-
---     local lock = false
 --     local cmd_id
 --     local next
 --     local action = {
@@ -258,6 +240,7 @@ return M
 --         set('n', key, action[act])
 --     end
 
+
 --     if hover.auto_close_events then
 --         cmd_id = api.nvim_create_autocmd(
 --             hover.auto_close_events, {
diff --git a/lua/Trans/util/bak_init.lua b/lua/Trans/util/bak_init.lua
deleted file mode 100644
index f29161d..0000000
--- a/lua/Trans/util/bak_init.lua
+++ /dev/null
@@ -1,264 +0,0 @@
-local M = {}
-local api, fn = vim.api, vim.fn
-
-if fn.executable('sqlite3') ~= 1 then
-    error('Please check out sqlite3')
-end
-
-local win_title = fn.has('nvim-0.9') == 1 and {
-        { '',       'TransTitleRound' },
-        { ' Trans', 'TransTitle' },
-        { '',       'TransTitleRound' },
-    } or nil
-
--- local title = {
---     "████████╗██████╗  █████╗ ███╗   ██╗███████╗",
---     "╚══██╔══╝██╔══██╗██╔══██╗████╗  ██║██╔════╝",
---     "   ██║   ██████╔╝███████║██╔██╗ ██║███████╗",
---     "   ██║   ██╔══██╗██╔══██║██║╚██╗██║╚════██║",
---     "   ██║   ██║  ██║██║  ██║██║ ╚████║███████║",
---     "   ╚═╝   ╚═╝  ╚═╝╚═╝  ╚═╝╚═╝  ╚═══╝╚══════╝",
---}
-
-
-string.width = api.nvim_strwidth
-string.isEn = function(self)
-    local char = { self:byte(1, -1) }
-    for i = 1, #self do
-        if char[i] > 128 then
-            return false
-        end
-    end
-    return true
-end
-
-string.play = fn.has('linux') == 1 and function(self)
-        local cmd = ([[echo "%s" | festival --tts]]):format(self)
-        fn.jobstart(cmd)
-    end or function(self)
-        local seperator = fn.has('unix') and '/' or '\\'
-        local file = debug.getinfo(1, "S").source:sub(2):match('(.*)lua') .. seperator .. 'tts' .. seperator .. 'say.js'
-        fn.jobstart('node ' .. file .. ' ' .. self)
-    end
-
-M.conf = {
-    view = {
-        i = 'float',
-        n = 'hover',
-        v = 'hover',
-    },
-    hover = {
-        width = 37,
-        height = 27,
-        border = 'rounded',
-        title = win_title,
-        keymap = {
-            pageup = '[[',
-            pagedown = ']]',
-            pin = '<leader>[',
-            close = '<leader>]',
-            toggle_entry = '<leader>;',
-            play = '_',
-        },
-        animation = {
-            -- open = 'fold',
-            -- close = 'fold',
-            open = 'slid',
-            close = 'slid',
-            interval = 12,
-        },
-        auto_close_events = {
-            'InsertEnter',
-            'CursorMoved',
-            'BufLeave',
-        },
-        auto_play = true,
-        timeout = 2000,
-        spinner = 'dots', -- 查看所有样式: /lua/Trans/util/spinner
-        -- spinner = 'moon'
-    },
-    float = {
-        width = 0.8,
-        height = 0.8,
-        border = 'rounded',
-        title = win_title,
-        keymap = {
-            quit = 'q',
-        },
-        animation = {
-            open = 'fold',
-            close = 'fold',
-            interval = 10,
-        },
-        tag = {
-            wait = '#519aba',
-            fail = '#e46876',
-            success = '#10b981',
-        },
-    },
-    order = { -- only work on hover mode
-        'title',
-        'tag',
-        'pos',
-        'exchange',
-        'translation',
-        'definition',
-    },
-    icon = {
-        star = '',
-        notfound = ' ',
-        yes = '✔',
-        no = '',
-        -- --- char: ■ | □ | ▇ | ▏ ▎ ▍ ▌ ▋ ▊ ▉ █
-        -- --- ◖■■■■■■■◗▫◻ ▆ ▆ ▇⃞ ▉⃞
-        cell = '■',
-        -- star = '⭐',
-        -- notfound = '❔',
-        -- yes = '✔️',
-        -- no = '❌'
-    },
-    theme = 'default',
-    -- theme = 'dracula',
-    -- theme = 'tokyonight',
-
-    db_path = '$HOME/.vim/dict/ultimate.db',
-    engine = {
-        youdao = {},
-        -- baidu = {
-        --     appid = '',
-        --     appPasswd = '',
-        -- },
-        -- -- youdao = {
-        --     appkey = '',
-        --     appPasswd = '',
-        -- },
-    },
-    -- TODO :
-    -- register word
-    -- history = {
-    --     -- TOOD
-    -- }
-
-    -- TODO :add online translate engine
-}
-
-local times = 0
-M.setup = function(opts)
-    if opts then
-        M.conf = vim.tbl_deep_extend('force', M.conf, opts)
-    end
-    local conf = M.conf
-
-    local float = conf.float
-    if 0 < float.height and float.height <= 1 then
-        float.height = math.floor((vim.o.lines - vim.o.cmdheight - 1) * float.height)
-    end
-    if 0 < float.width and float.width <= 1 then
-        float.width = math.floor(vim.o.columns * float.width)
-    end
-
-    local engines = {}
-    local i = 1
-    for k, _ in pairs(conf.engine) do
-        engines[i] = k
-        i = i + 1
-    end
-
-    conf.engines = engines
-    times = times + 1
-    if times == 1 then
-        ---@format disable
-        local new_command = api.nvim_create_user_command
-        new_command('Translate', function() M.translate() end, { desc = '  单词翻译', })
-        new_command('TranslateInput', function() M.translate('i') end, { desc = '  搜索翻译', })
-        new_command('TransPlay', function()
-            local word = M.get_word(api.nvim_get_mode().mode)
-            if word ~= '' and word:isEn() then
-                word:play()
-            end
-        end, { desc = ' 自动发音' })
-
-
-        local set_hl = api.nvim_set_hl
-        local hls    = require('Trans.ui.theme')[conf.theme]
-        for hl, opt in pairs(hls) do
-            set_hl(0, hl, opt)
-        end
-        ---@format enable
-    end
-end
-
-local function get_select()
-    local _start = fn.getpos("v")
-    local _end = fn.getpos('.')
-
-    if _start[2] > _end[2] or (_start[3] > _end[3] and _start[2] == _end[2]) then
-        _start, _end = _end, _start
-    end
-    local s_row, s_col = _start[2], _start[3]
-    local e_row, e_col = _end[2], _end[3]
-
-    -- print(s_row, e_row, s_col, e_col)
-    ---@type string
-    ---@diagnostic disable-next-line: assign-type-mismatch
-    local line = fn.getline(e_row)
-    local uidx = vim.str_utfindex(line, math.min(#line, e_col))
-    e_col = vim.str_byteindex(line, uidx)
-
-    if s_row == e_row then
-        return line:sub(s_col, e_col)
-    else
-        local lines = fn.getline(s_row, e_row)
-        local i = #lines
-        lines[1] = lines[1]:sub(s_col)
-        lines[i] = line:sub(1, e_col)
-        return table.concat(lines)
-    end
-end
-
-M.get_word = function(mode)
-    local word
-    if mode == 'n' then
-        word = fn.expand('<cword>')
-    elseif mode == 'v' then
-        api.nvim_input('<ESC>')
-        word = get_select()
-    elseif mode == 'i' then
-        -- TODO Use Telescope with fuzzy finder
-        ---@diagnostic disable-next-line: param-type-mismatch
-        word = fn.input('请输入需要查询的单词:')
-    else
-        error('invalid mode: ' .. mode)
-    end
-    return word
-end
-
-
-M.translate = function(mode, view)
-    local function demo()
-        local frame = 1000
-        for i = 1, 10 do
-            print('now is ' .. i)
-            vim.wait(frame)
-        end
-    end
-    vim.loop.new_async(demo):send()
-    -- vim.validate {
-    --     mode = { mode, 's', true },
-    --     view = { view, 's', true }
-    -- }
-
-    -- mode = mode or api.nvim_get_mode().mode
-    -- view = view or M.conf.view[mode]
-    -- assert(mode and view)
-    -- local word = M.get_word(mode)
-    -- if word == nil or word == '' then
-    --     return
-    -- else
-    --     require('Trans.view.' .. view)(word:gsub('^%s+', '', 1))
-    -- end
-end
-
-M.ns = api.nvim_create_namespace('Trans')
-
-return M