diff --git a/frontend/index.html b/frontend/index.html
index ab5d86b..f329d6a 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -48,8 +48,10 @@
         <div class="flex items-center gap-1 bg-slate-900 border border-slate-700/70 rounded-xl px-2 py-1">
           <span class="text-xs">🌐</span>
           <select id="selectLang" class="bg-transparent text-xs font-bold text-slate-300 outline-none cursor-pointer">
+            <!-- Add language here -->>
             <option value="fr" class="bg-slate-900">FR</option>
             <option value="en" class="bg-slate-900">EN</option>
+            <option value="cn" class="bg-slate-900">CN</option>
           </select>
         </div>
 
diff --git a/frontend/locales/cn.json b/frontend/locales/cn.json
new file mode 100644
index 0000000..bee91c1
--- /dev/null
+++ b/frontend/locales/cn.json
@@ -0,0 +1,56 @@
+{
+  "app": {
+    "title": "药代动力学",
+    "version": "v1.00 • 乔治·米翁博士"
+  },
+  "nav": {
+    "mode_esk": "艾斯克塔明",
+    "mode_rac": "消旋体",
+    "calculator": "计算器",
+    "export_pdf": "导出 PDF",
+    "raz": "重置"
+  },
+  "patient": {
+    "title": "患者参数",
+    "weight": "体重 (kg)",
+    "age": "年龄 (岁)",
+    "height": "身高 (cm)",
+    "concentration": "药物浓度 (mg/mL)"
+  },
+  "models": {
+    "title": "药代动力学模型"
+  },
+  "timeline": {
+    "title": "给药与输液时间线 (0 - 300 分钟)",
+    "scroll_hint": "水平滚动 👉",
+    "bolus": "bolus 剂量 (mg)",
+    "perf": "输注速率 (mg/kg/h)"
+  },
+  "calculator": {
+    "title": "计算器与剂量换算",
+    "patient_weight": "患者体重",
+    "drug_conc": "浓度",
+    "bolus_header": "推注剂量换算",
+    "total_dose": "总剂量 (mg)",
+    "relative_dose": "相对剂量 (mg/kg)",
+    "infusion_header": "输液换算",
+    "rate_mgkgh": "速率 (mg/kg/h)",
+    "rate_ugkgmin": "速率 (µg/kg/min)"
+  },
+  "zones": {
+    "inactive": "非活性期",
+    "anti_hyperalgesic": "抗痛觉过敏期",
+    "analgesia": "镇痛期",
+    "psychedelic": "致幻期",
+    "emergence": "苏醒期",
+    "narcosis": "麻醉",
+    "excessive": "过量"
+  },
+  "pdf": {
+    "title": "KetaPK - 药代动力学模拟报告",
+    "date": "模拟日期：",
+    "mode": "所选模式：",
+    "patient_info": "患者：体重 {weight} 公斤 | 年龄 {age} 岁 | 身高 {height} 厘米",
+    "disclaimer": "由 KetaPK Web 生成。请仔细核对"
+  }
+}
\ No newline at end of file
diff --git a/frontend/locales/en.json b/frontend/locales/en.json
index a55a5ac..366b652 100644
--- a/frontend/locales/en.json
+++ b/frontend/locales/en.json
@@ -51,6 +51,6 @@
     "date": "Simulation Date: ",
     "mode": "Selected Mode: ",
     "patient_info": "Patient: Weight {weight} kg | Age {age} yrs | Height {height} cm",
-    "disclaimer": "Generated by KetaPK Web. For educational purposes only."
+    "disclaimer": "Generated by KetaPK Web. Please double-check."
   }
 }
\ No newline at end of file
diff --git a/frontend/locales/fr.json b/frontend/locales/fr.json
index 6f92220..33191e4 100644
--- a/frontend/locales/fr.json
+++ b/frontend/locales/fr.json
@@ -51,6 +51,6 @@
     "date": "Date de simulation : ",
     "mode": "Mode sélectionné : ",
     "patient_info": "Patient : Poids {weight} kg | Âge {age} ans | Taille {height} cm",
-    "disclaimer": "Ce document est généré par KétaPK Web. Destiné uniquement à l'enseignement."
+    "disclaimer": "Ce document est généré par KétaPK Web. Veuillez vérifier les sorties avant toute action."
   }
 }
\ No newline at end of file