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Update typeCompatibility.md #247

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2 changes: 1 addition & 1 deletion docs/typings/typeCompatibility.md
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Expand Up @@ -70,7 +70,7 @@ iTakePoint2D({ x: 0 }); // Error: 没有 'y'

## 变体

对类型兼容性来说，变体是一个利于理解和重要的概念。
对类型兼容性来说，变体是一个利于理解且重要的概念。

对一个简单类型 `Base` 和 `Child` 来说，如果 `Child` 是 `Base` 的子类，`Child` 的实例能被赋值给 `Base` 类型的变量。

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