diff --git a/lua/Trans/backend/youdao.lua b/lua/Trans/backend/youdao.lua
index 3dc4cfc..ed8d425 100644
--- a/lua/Trans/backend/youdao.lua
+++ b/lua/Trans/backend/youdao.lua
@@ -81,6 +81,44 @@ local field = {
 }
 
 
+
+function M.debug(body)
+    if not body then
+        vim.notify('Unknown errors, nil body', vim.log.levels.ERROR)
+    end
+    local debug_msg = ({
+        [101] = "缺少必填的参数,首先确保必填参数齐全，然后确认参数书写是否正确。",
+        [102] = "不支持的语言类型",
+        [103] = "翻译文本过长",
+        [104] = "不支持的API类型",
+        [105] = "不支持的签名类型",
+        [106] = "不支持的响应类型",
+        [107] = "不支持的传输加密类型",
+        [108] = "应用ID无效，注册账号，登录后台创建应用和实例并完成绑定，可获得应用ID和应用密钥等信息",
+        [109] = "batchLog格式不正确",
+        [110] = "无相关服务的有效实例,应用没有绑定服务实例，可以新建服务实例，绑定服务实例。注：某些服务的翻译结果发音需要tts实例，需要在控制台创建语音合成实例绑定应用后方能使用。",
+        [111] = "开发者账号无效",
+        [113] = "q不能为空",
+        [120] = "不是词，或未收录",
+        [201] = "解密失败，可能为DES,BASE64,URLDecode的错误",
+        [202] = "签名检验失败",
+        [203] = "访问IP地址不在可访问IP列表",
+        [205] = "请求的接口与应用的平台类型不一致，确保接入方式（Android SDK、IOS SDK、API）与创建的应用平台类型一致。如有疑问请参考入门指南",
+        [206] = "因为时间戳无效导致签名校验失败",
+        [207] = "重放请求",
+        [301] = "辞典查询失败",
+        [302] = "翻译查询失败",
+        [303] = "服务端的其它异常",
+        [305] = "批量翻译部分成功",
+        [401] = "账户已经欠费，请进行账户充值",
+        [411] = "访问频率受限,请稍后访问",
+        [412] = "长请求过于频繁，请稍后访问",
+        [390001] = "词典名称不正确",
+    })[tonumber(body.errorCode)]
+
+    vim.notify('Youdao API Error: ' .. (debug_msg or vim.inspect(body)), vim.log.levels.ERROR)
+end
+
 ---@overload fun(TransData): TransResult
 ---Query Using Youdao API
 ---@param data TransData
@@ -97,6 +135,7 @@ function M.query(data)
         end
 
         if not status or not body or body.errorCode ~= "0" then
+            if not require('Trans').conf.debug then M.debug(body) end
             data.result.youdao = false
             data[#data + 1] = res
             return
@@ -112,15 +151,17 @@ function M.query(data)
 
 
         local tmp = {
-            title                                                 = {
+            title    = {
                 word     = body.query,
                 phonetic = body.basic.phonetic,
             },
-            web                                                   = body.web,
-            phrases                                               = body.phrases,
-            explains                                              = body.basic.explains,
-            synonyms                                              = body.synonyms,
-            sentenceSample                                        = body.sentenceSample,
+            web      = body.web,
+            explains = body.basic.explains,
+            -- phrases                                               = body.phrases,
+            -- synonyms                                              = body.synonyms,
+            -- sentenceSample                                        = body.sentenceSample,
+
+
             [data.from == 'en' and 'translation' or 'definition'] = body.translation,
         }
 
diff --git a/lua/Trans/core/buffer.lua b/lua/Trans/core/buffer.lua
index 7ca2aa2..7f8fcfd 100644
--- a/lua/Trans/core/buffer.lua
+++ b/lua/Trans/core/buffer.lua
@@ -106,7 +106,7 @@ end
 function buffer:add_highlight(linenr, hl_group, col_start, col_end, ns)
     -- vim.print(linenr, hl_group, col_start, col_end, ns)
     main_loop(function()
-        linenr = linenr - 1 or -1
+        linenr = linenr - 1
         col_start = col_start or 0
         api.nvim_buf_add_highlight(self.bufnr, ns or -1, hl_group, linenr, col_start, col_end or -1)
     end)
@@ -159,7 +159,7 @@ buffer.__index = function(self, key)
     if res then
         return res
     elseif type(key) == 'number' then
-        -- return fn.getbufoneline(self.bufnr, key) -- Vimscript Function Or Lua API ?? -- INFO :v0.8.1 doesn't support getbufoneline
+        -- return fn.getbufoneline(self.bufnr, key) -- Vimscript Function Or Lua API ?? -- INFO :only work on neovim-nightly
         return api.nvim_buf_get_lines(self.bufnr, key - 1, key, true)[1]
     else
         error('invalid key: ' .. key)
diff --git a/lua/Trans/core/conf.lua b/lua/Trans/core/conf.lua
index b26bd53..bd2127f 100644
--- a/lua/Trans/core/conf.lua
+++ b/lua/Trans/core/conf.lua
@@ -16,6 +16,7 @@ return {
     ---@type string the directory for database file and password file
     dir      = os.getenv('HOME') .. '/.vim/dict',
     query    = 'fallback',
+    debug    = true,
     -- backend_order = {},
     ---@type 'default' | 'dracula' | 'tokyonight' global Trans theme [see lua/Trans/style/theme.lua]
     theme    = 'default', -- default | tokyonight | dracula
@@ -102,11 +103,11 @@ return {
                 no          = '', -- ❌ | ❎ | ✖ | ✘ | ✗ |
                 cell        = '■', -- ■  | □ | ▇ | ▏ ▎ ▍ ▌ ▋ ▊ ▉ █
                 web         = '󰖟', --🌍 | 🌎 | 🌏 | 🌐 |
-                tag         = ' ',
+                tag         = '',
                 pos         = '',
                 translation = '󰊿',
                 definition  = '󰗊',
-                exchange    = '✳',
+                exchange    = '',
             },
         },
     },
diff --git a/lua/Trans/core/util.lua b/lua/Trans/core/util.lua
index 14c42f5..2cfbeb6 100644
--- a/lua/Trans/core/util.lua
+++ b/lua/Trans/core/util.lua
@@ -143,6 +143,43 @@ function M.main_loop(func)
     coroutine.yield()
 end
 
+---Split text into paragraphs
+---@param lines string[] text to be split
+---@return string[][] paragraphs
+function M.split_to_paragraphs(lines, opts)
+    --- TODO :More options and better algorithm to detect paragraphs
+    opts = opts or {}
+    local paragraphs = {}
+    local paragraph = {}
+    for _, line in ipairs(lines) do
+        if line == '' then
+            paragraphs[#paragraphs + 1] = paragraph
+            paragraph = {}
+        else
+            paragraph[#paragraph + 1] = line
+        end
+    end
+    return paragraphs
+end
+
+---Get visible lines in the window or current window
+---@param opts { winid: integer, height: integer }?
+---@return string[]
+function M.visible_lines(opts)
+    opts = opts or {}
+
+    -- INFO : don't calculate the height of statusline and cmdheight or winbar?
+    local winid                 = opts.winid or 0
+    local win_height            = opts.height or api.nvim_win_get_height(winid)
+    local current_line          = api.nvim_win_get_cursor(winid)[1]
+    local current_relative_line = vim.fn.winline()
+
+
+    local _start = current_line - current_relative_line
+    local _end   = _start + win_height - vim.o.cmdheight --[[ - 1 -- maybe 1 for statusline?? ]]
+
+    return api.nvim_buf_get_lines(0, _start, _end, false)
+end
 
 ---@class Trans
 ---@field util TransUtil
diff --git a/lua/Trans/core/window.lua b/lua/Trans/core/window.lua
index d885dc4..e17086b 100644
--- a/lua/Trans/core/window.lua
+++ b/lua/Trans/core/window.lua
@@ -1,4 +1,5 @@
 local api = vim.api
+---@class Trans
 local Trans = require("Trans")
 
 ---@class TransWindow
@@ -110,6 +111,7 @@ function window:resize(opts)
     end
 end
 
+
 ---Try to close window with animation?
 function window:try_close()
     local close_animation = self.animation.close
diff --git a/lua/Trans/frontend/hover/youdao.lua b/lua/Trans/frontend/hover/youdao.lua
index 0819524..ae1a9a4 100644
--- a/lua/Trans/frontend/hover/youdao.lua
+++ b/lua/Trans/frontend/hover/youdao.lua
@@ -10,7 +10,6 @@ function M.web(hover, result)
     local buffer = hover.buffer
     buffer:setline(co(hover.opts.icon.web .. ' 网络释义'))
 
-    local indent = interval .. interval .. hover.opts.icon.list .. ' '
     local function remove_duplicate(strs)
         local uniq_strs = {}
         local str_map = {}
@@ -29,6 +28,7 @@ function M.web(hover, result)
         return uniq_strs
     end
 
+    local indent = interval .. '  ' .. hover.opts.icon.list .. ' '
     for _, w in ipairs(result.web) do
         buffer:setline(it(
             interval .. w.key,