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Update type-of-object-interfaces.md #56

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## 什么是接口

在面向对象语言中，接口（Interfaces）是一个很重要的概念，它是对行为的抽象，而具体如何行动需要由类（classes）去实现（implements）。
在面向对象语言中，接口（Interfaces）是一个很重要的概念，它是对行为的抽象，而具体如何行动需要由类（classes）去实现（implement）。

TypeScript 中的接口是一个非常灵活的概念，除了可用于[对类的一部分行为进行抽象](../advanced/class-and-interfaces.md#类实现接口)以外，也常用于对「对象的形状（Shape）」进行描述。

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