“构造函数”必须使用this来恰当地初始化对象属性。

The so-called "constructor" must use this to properly initialize the object's properties.

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添加一个构造函数，并定义一个私有属性。

We add a constructor that also defines a private property.

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添加一个构造函数，并定义一个私有属性。

We add a constructor that also defines a private property.

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