diff --git a/assets/images/tiled/maps/city.tmj b/assets/images/tiled/maps/city.tmj
index 20f8993..cdebdf4 100644
--- a/assets/images/tiled/maps/city.tmj
+++ b/assets/images/tiled/maps/city.tmj
@@ -988,6 +988,17 @@
                  "width":50,
                  "x":1454.66666666667,
                  "y":50
+                }, 
+                {
+                 "height":16,
+                 "id":25,
+                 "name":"chair",
+                 "rotation":0,
+                 "type":"",
+                 "visible":true,
+                 "width":17.2727272727273,
+                 "x":159.454545454545,
+                 "y":975.454545454545
                 }],
          "opacity":1,
          "type":"objectgroup",
@@ -1018,7 +1029,7 @@
          "y":0
         }],
  "nextlayerid":16,
- "nextobjectid":25,
+ "nextobjectid":26,
  "orientation":"orthogonal",
  "renderorder":"right-down",
  "tiledversion":"1.10.2",
diff --git a/lib/common/toast_utils.dart b/lib/common/toast_utils.dart
index 74c778e..906976b 100644
--- a/lib/common/toast_utils.dart
+++ b/lib/common/toast_utils.dart
@@ -11,7 +11,7 @@ class ToastUtils {
         alignment: Alignment.bottomCenter,
         builder: (ctx, holder) {
           return SizedBox(
-            width: 200,
+            width: tip.length > 10 ? 400 : 200,
             height: 50,
             child: Center(
                 child: Text(
diff --git a/lib/game/decorations/chair.dart b/lib/game/decorations/chair.dart
new file mode 100644
index 0000000..b876728
--- /dev/null
+++ b/lib/game/decorations/chair.dart
@@ -0,0 +1,34 @@
+import 'package:bonfire/bonfire.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:make_a_dream/common/toast_utils.dart';
+import 'package:make_a_dream/game/notifiers/player_notifier.dart';
+
+class Chair extends GameDecoration with Sensor<Player> {
+  Chair({required super.position, required super.size, required this.ref});
+
+  bool isTouched = false;
+  final WidgetRef ref;
+
+  @override
+  void onContact(Player component) {
+    super.onContact(component);
+    if (gameRef.player != null && !isTouched) {
+      gameRef.player!.stopMove();
+      isTouched = true;
+      if (ref.read(playerProvider).current!.knowledge.total > 650) {
+        ToastUtils.decorationTip(null, tip: "是时候了！");
+      } else {
+        ToastUtils.decorationTip(null, tip: "时机尚未成熟，我的朋友...");
+        // [23 * 16  = 368,58 * 928]
+        gameRef.player!.translate(Vector2(368 - position.x, 928 - position.y));
+        gameRef.player!.moveDown();
+      }
+    }
+  }
+
+  @override
+  void onContactExit(Player component) {
+    isTouched = false;
+    super.onContactExit(component);
+  }
+}
diff --git a/lib/game/decorations/gaoshi.dart b/lib/game/decorations/gaoshi.dart
index 8cc0c4b..f7613b0 100644
--- a/lib/game/decorations/gaoshi.dart
+++ b/lib/game/decorations/gaoshi.dart
@@ -17,7 +17,7 @@ class Gaoshi extends GameDecoration with Sensor<Player>, DecorationMixin {
       gameRef.player!.stopMove();
 
       showGeneralDialog(
-          barrierLabel: "fes",
+          barrierLabel: "gaoshi",
           barrierDismissible: true,
           context: context,
           barrierColor: Colors.transparent,
diff --git a/lib/game/maps/city_of_dream.dart b/lib/game/maps/city_of_dream.dart
index 7d9cfad..71f0eaf 100644
--- a/lib/game/maps/city_of_dream.dart
+++ b/lib/game/maps/city_of_dream.dart
@@ -5,6 +5,7 @@ import 'package:bonfire/bonfire.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:make_a_dream/game/decorations/chair.dart';
 import 'package:make_a_dream/game/decorations/classroom_entry.dart';
 import 'package:make_a_dream/game/decorations/fes.dart';
 import 'package:make_a_dream/game/decorations/fountain.dart';
@@ -49,6 +50,8 @@ class CityOfDream extends ConsumerWidget {
                   ClassroomEntry(position: p.position, size: p.size, ref: ref),
               "gaoshi": (p) =>
                   Gaoshi(position: p.position, size: p.size, ref: ref),
+              "chair": (p) =>
+                  Chair(position: p.position, size: p.size, ref: ref)
               // "teacher2": (p) => BaseMentor(
               //     position: p.position,
               //     size: p.size,
diff --git a/lib/isar/player_record.dart b/lib/isar/player_record.dart
index 7d2871a..7da466f 100644
--- a/lib/isar/player_record.dart
+++ b/lib/isar/player_record.dart
@@ -210,6 +210,16 @@ class PlayerKnowledge {
   late double /* 生物 */ biography = 0;
   late double /* IT */ it = 0;
 
+  double get total =>
+      math +
+      language +
+      history +
+      geography +
+      chemistry +
+      physics +
+      biography +
+      it;
+
   String getKnowledgePrompt(
       {String teacherType = 'science teacher', String? his}) {
     String s = "你的学生基本情况如下:\n";