Objects in one class might contain references to objects in another class.

一个类中的对象可能包含了另一个类对象的引用。

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You also need to be able to store references to objects of different lifetimes.

您还需要能够存储对具有不同生存期的对象的引用。

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You also need to be able to store references to objects of different lifetimes.

您还需要能够存储对具有不同生存期的对象的引用。

youdao