These operators return dynamic type information only for classes with one or more virtual functions. For all other types, information for the static (i. e. , compile-time) type is returned.

这些操作符只为带有一个或多个虚函数的类返回动态类型信息，对于其他类型，返回静态（即编译时）类型的信息。

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You can send or receive letters to people anywhere. You can also store, delete and compile information. In a word, E-mail helps you overcome spatial and time limitations in communication.

你可以向任何地方的人发送和接收信件，你还可以存储，删除和编辑信息，总之，电子邮件帮助我们克服通信上的时空限制。

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