diff --git a/packages/hydrooj/locales/zh.yaml b/packages/hydrooj/locales/zh.yaml
index 510455e71..418be668a 100644
--- a/packages/hydrooj/locales/zh.yaml
+++ b/packages/hydrooj/locales/zh.yaml
@@ -96,6 +96,7 @@ Auto format code: 自动格式化代码
 Auto organize input: 自动整理输入
 Avatar: 头像
 Back to contest list: 返回比赛列表
+Background: 背景
 Be Copied: 被复制
 Begin at: 开始于
 Begin Date: 开始日期
diff --git a/packages/hydrooj/locales/zh_TW.yaml b/packages/hydrooj/locales/zh_TW.yaml
index 84df2903f..10a630467 100644
--- a/packages/hydrooj/locales/zh_TW.yaml
+++ b/packages/hydrooj/locales/zh_TW.yaml
@@ -30,7 +30,6 @@ __langname: 正體中文
 'Discussion: Terms Of Service': '討論區服務條款'
 'First Blood Notice\n{0} solved problem {1} ({2})': '題目首殺提示\n{0} 解決了題目 {1} ({2})'
 'Format: category 1, sub category 1.1, sub category 1.2, ..., sub category 1.x, ..., category n, sub category n.1, sub category n.2, ..., sub category n.m, ...': '格式：分類1, 子分類1.1, 子分類1.2, ..., 子分類1.x, ..., 分類n, 子分類n.1, 子分類n.2, ..., 子分類n.m, ...'
-Join {0}: 加入 {0}
 'No': '否'
 'Note: Problem title may not be hidden.': '注意：題目標題可能不會被隱藏。'
 'Or upload a file:': '或者上傳一個檔案：'
@@ -39,9 +38,6 @@ Join {0}: 加入 {0}
 'Solved {0} problems, RP: {1} (No. {2})': '解決了 {0} 道題目，RP: {1} (No. {2})'
 'The value `{1}` of {0} already exists.': '{0} 的值 `{1}` 已經存在。'
 'Yes': '是'
-Effects only when Difficulty is not 'Use algorithm calculated'.: 僅當難度不為“使用演算法計算”時才起效。
-Split by ',' '.': 由"，"、"、"或"。"分隔。
-What's file?: 什麼是檔案？
 (All Problems): (所有題目)
 (None): (無)
 (Not changed): 未更改
@@ -96,6 +92,7 @@ Auto format code: 自動格式化程式碼
 Auto organize input: 自動整理輸入
 Avatar: 頭像
 Back to contest list: 返回比賽列表
+Background: 背景
 Be Copied: 被複制
 Begin at: 開始於
 Begin Date: 開始日期
@@ -321,6 +318,7 @@ Edit problems: 修改題目
 Edit Profile: 編輯個人資訊
 Edit training plans: 修改訓練計劃
 Edit: 編輯
+Effects only when Difficulty is not 'Use algorithm calculated'.: 僅當難度不為“使用演算法計算”時才起效。
 Email Visibility: Email 可見性
 Email: 電子郵件
 Enabled: 開啟
@@ -431,6 +429,7 @@ IO: 輸入輸出
 Is rated: 計入排名
 It works!: 它成了！
 Italic: 斜體
+Join {0}: 加入 {0}
 Join: 加入
 Judge Status: 評測狀態
 judge_playground: 評測遊樂場
@@ -756,6 +755,7 @@ Solutions per page: 每頁展示的題解數量
 Sorry: 對不起
 Sort by: 排序
 Source type: 來源型別
+Split by ',' '.': 由"，"、"、"或"。"分隔。
 Split View: 分屏預覽
 Star Topic: 收藏討論
 Star: 收藏
@@ -919,6 +919,7 @@ Week: 周
 What is domain?: 什麼是域?
 What is this?: 這是什麼？
 What's domain?: 什麼是域？
+What's file?: 什麼是檔案？
 What's script?: 什麼是指令碼？
 What's this?: 這是什麼？
 Whether to show tags in the problem list.: 是否在題目列表中顯示題目的標籤。
diff --git a/packages/hydrooj/src/entry/cli.ts b/packages/hydrooj/src/entry/cli.ts
index 6137fd070..a3c81f57c 100644
--- a/packages/hydrooj/src/entry/cli.ts
+++ b/packages/hydrooj/src/entry/cli.ts
@@ -9,7 +9,7 @@ import { load as loadOptions } from '../options';
 import { MongoService } from '../service/db';
 import { SettingService } from '../settings';
 import {
-    addon, builtinModel, model, service,
+    addon, builtinModel, locale, model, service,
 } from './common';
 
 const argv = cac().parse();
@@ -110,6 +110,7 @@ export async function load(ctx: Context) {
     require('../service/bus').apply(ctx);
     const pending = global.addons;
     const fail = [];
+    await locale(pending, fail);
     await ctx.plugin(MongoService, loadOptions() || {});
     await ctx.plugin(SettingService);
     await ctx.plugin(SystemModel.Service);
diff --git a/packages/hydrooj/src/lib/content.ts b/packages/hydrooj/src/lib/content.ts
index f31891c15..230164d43 100644
--- a/packages/hydrooj/src/lib/content.ts
+++ b/packages/hydrooj/src/lib/content.ts
@@ -1,4 +1,5 @@
 export interface ProblemSource {
+    background?: string;
     description?: string;
     input?: string;
     output?: string;
@@ -43,36 +44,33 @@ export function buildContent(source: ProblemSource, type: 'markdown' | 'html' =
                 '',
             ]).join('\n');
     }
-    return type === 'html'
-        ? [
-            ...source.description ? [`<h2>${_('Description')}</h2>`, source.description] : [],
-            ...source.input ? [`<h2>${_('Input Format')}</h2>`, source.input] : [],
-            ...source.output ? [`<h2>${_('Output Format')}</h2>`, source.output] : [],
-            ...(source.samples || []).map((sample, i) => [
+    const line = (title: string, s: string) => s ? (type === 'html' ? [`<h2>${_(title)}</h2>`, s] : [`## ${_(title)}`, '', s, '']) : [];
+    return [
+        line('Background', source.background),
+        line('Problem Description', source.description),
+        line('Input Format', source.input),
+        line('Output Format', source.output),
+        type === 'html'
+            ? (source.samples || []).map((sample, i) => [
                 `<pre><code class="language-input${i + 1}">`,
                 sample[0],
                 `</code></pre><pre><code class="language-output${i + 1}">`,
                 sample[1],
                 '</code></pre>',
-            ].join('')),
-            ...source.samplesRaw ? [source.samplesRaw] : [],
-            ...source.hint ? [`<h2>${_('Hint')}</h2>`, source.hint] : [],
-            ...source.source ? [`<h2>${_('Source')}</h2>`, source.source] : [],
-        ].join('\n')
-        : [
-            ...source.description ? [`## ${_('Description')}`, '', source.description, ''] : [],
-            ...source.input ? [`## ${_('Input Format')}`, '', source.input, ''] : [],
-            ...source.output ? [`## ${_('Output Format')}`, '', source.output, ''] : [],
-            ...(source.samples || []).flatMap((sample, i) => [
+            ].join(''))
+            : (source.samples || []).flatMap((sample, i) => [
+                '',
                 `\`\`\`input${i + 1}`,
                 sample[0],
                 '```',
+                '',
                 `\`\`\`output${i + 1}`,
                 sample[1],
                 '```',
+                '',
             ]),
-            ...source.samplesRaw ? [source.samplesRaw] : [],
-            ...source.hint ? [`## ${_('Hint')}`, '', source.hint, ''] : [],
-            ...source.source ? [`## ${_('Source')}`, '', source.source, ''] : [],
-        ].join('\n');
+        ...source.samplesRaw ? [source.samplesRaw] : [],
+        line('Hint', source.hint),
+        line('Source', source.source),
+    ].flat().join('\n');
 }