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diff --git a/‎docs/contents/ch12.md
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+4-4Lines changed: 4 additions & 4 deletions b/‎docs/contents/ch12.md
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+4-4Lines changed: 4 additions & 4 deletions
diff --git a/‎notes/ch12.ipynb
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+4-4Lines changed: 4 additions & 4 deletions
@@ -187,7 +187,7 @@ v7[-1:]
 
 
 
-## 12.4 Vector类第3版：动态存取属性
+## 12.3 Vector类第3版：动态存取属性
 
 **改进方案：**
 1. 新增支持位置模式匹配`__match_args__`。
@@ -296,7 +296,7 @@ v.y, v.z, v.t
 
 
 
-## 12.5 Vector类第4版：哈希和快速等值测试
+## 12.4 Vector类第4版：哈希和快速等值测试
 
 **改进方案：**
 1. 新增`__eq__`方法：先判断两个对象的长度是否相等，再比较其中各个元素是否相等。
@@ -374,7 +374,7 @@ class VectorV4:
         return cls(memv)
 ```
 
-## 12.6 Vector第5版：格式化
+## 12.5 Vector第5版：格式化
 
 **改进方案：**
 1. 新增`angle(self, n)`函数：使用n维球体的公式计算角坐标。
@@ -477,7 +477,7 @@ class VectorV5:
         return cls(memv)
 ```
 
-## 12.7 杂谈
+## 12.6 杂谈
 
 - 把协议当作非正式接口：
     - 模仿内置类型实现类时，记住一点：模仿的程度对建模的对象来说合理即可。
 
@@ -288,7 +288,7 @@
    "id": "7130b999",
    "metadata": {},
    "source": [
-    "## 12.4 Vector类第3版：动态存取属性"
+    "## 12.3 Vector类第3版：动态存取属性"
    ]
   },
   {
@@ -432,7 +432,7 @@
    "id": "84b7a1cb",
    "metadata": {},
    "source": [
-    "## 12.5 Vector类第4版：哈希和快速等值测试"
+    "## 12.4 Vector类第4版：哈希和快速等值测试"
    ]
   },
   {
@@ -527,7 +527,7 @@
    "id": "b8872eb6",
    "metadata": {},
    "source": [
-    "## 12.6 Vector第5版：格式化"
+    "## 12.5 Vector第5版：格式化"
    ]
   },
   {
@@ -647,7 +647,7 @@
    "id": "b3814a5b",
    "metadata": {},
    "source": [
-    "## 12.7 杂谈"
+    "## 12.6 杂谈"
    ]
   },
   {
Original file line number	Diff line number	Diff line change
`@@ -288,7 +288,7 @@`
`288`	`288`	`"id": "7130b999",`
`289`	`289`	`"metadata": {},`
`290`	`290`	`"source": [`
`291`		`- "## 12.4 Vector类第3版：动态存取属性"`
	`291`	`+ "## 12.3 Vector类第3版：动态存取属性"`
`292`	`292`	`]`
`293`	`293`	`},`
`294`	`294`	`{`
`@@ -432,7 +432,7 @@`
`432`	`432`	`"id": "84b7a1cb",`
`433`	`433`	`"metadata": {},`
`434`	`434`	`"source": [`
`435`		`- "## 12.5 Vector类第4版：哈希和快速等值测试"`
	`435`	`+ "## 12.4 Vector类第4版：哈希和快速等值测试"`
`436`	`436`	`]`
`437`	`437`	`},`
`438`	`438`	`{`
`@@ -527,7 +527,7 @@`
`527`	`527`	`"id": "b8872eb6",`
`528`	`528`	`"metadata": {},`
`529`	`529`	`"source": [`
`530`		`- "## 12.6 Vector第5版：格式化"`
	`530`	`+ "## 12.5 Vector第5版：格式化"`
`531`	`531`	`]`
`532`	`532`	`},`
`533`	`533`	`{`
`@@ -647,7 +647,7 @@`
`647`	`647`	`"id": "b3814a5b",`
`648`	`648`	`"metadata": {},`
`649`	`649`	`"source": [`
`650`		`- "## 12.7 杂谈"`
	`650`	`+ "## 12.6 杂谈"`
`651`	`651`	`]`
`652`	`652`	`},`
`653`	`653`	`{`