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修改病句，“一个段字符串”改为“一段字符串” (#1182)

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BeautifulSoft
2022-03-23 20:12:21 +08:00
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source/02_language_guide/03_Strings_and_Characters.md
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@ -416,7 +416,7 @@ for index in greeting.indices {
### 插入和删除 {#inserting-and-removing} ### 插入和删除 {#inserting-and-removing}
调用 `insert(_:at:)` 方法可以在一个字符串的指定索引插入一个字符，调用 `insert(contentsOf:at:)` 方法可以在一个字符串的指定索引插入一个段字符串。 调用 `insert(_:at:)` 方法可以在一个字符串的指定索引插入一个字符，调用 `insert(contentsOf:at:)` 方法可以在一个字符串的指定索引插入一段字符串。
```swift ```swift
var welcome = "hello" var welcome = "hello"