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docs(utility): fixed typo
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docs/utility.md

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@@ -412,7 +412,7 @@ type T3 = Pick<A, 'x'|'y'>; // { x: number; y: number }
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上面示例中,`Pick<Type, Keys>`会从对象类型`A`里面挑出指定的键名,组成一个新的对象类型。
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指定的键名`Keys`必须是对象键名`Type`里面已经存在的键名,否则会报错。
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指定的键名`Keys`必须是对象类型`Type`里面已经存在的键名,否则会报错。
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```typescript
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interface A {

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