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Update 2.4.md #21

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## 2.4.3 非局部赋值的代价

我们扩展了我们的计算环境模型，用于解释非局部赋值的效果。但是，非局部复制与我们思考名称和值的方式有一些细微差异。
我们扩展了我们的计算环境模型，用于解释非局部赋值的效果。但是，非局部赋值与我们思考名称和值的方式有一些细微差异。

之前，我们的值并没有改变，仅仅是我们的名称和绑定发生了变化。当两个名称`a`和`b`绑定到`4`上时，它们绑定到了相同的`4`还是不同的`4`并不重要。我们说，只有一个`4`对象，并且它永不会改变。

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