As emphatic as it may sound, this is not something that we get out of the box with plain object orientation.

这是为重点的听起来，不我们走出与普通对象定位框的东西。

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Plain object orientation makes it possible to use any derived classes in places where the parent class is expected.

平原对象定位使得在父类别预计的地方使用派生的任何类。

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Incidentally, enabling AOP within plain object-oriented languages is one example of using metadata for language extension.

顺便说一下，在纯面向对象的语言中启用AOP是使用元数据进行语言扩展的一个例子。

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