其次，设置发件人地址和收件人地址数组。

Next, the From address and an array of To addresses are set.

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TLS 数组是系统为每个线程维护的地址数组。

The TLS array is an array of addresses that the system maintains for each thread.

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例如，在Person示例中，可以添加im地址数组；只需更新迭代器，无需更改遍历地址的任何代码。

In the Person example, for instance, you could add an array of im addresses; simply by updating the iterator, you don't have to change any code that loops through the addresses for display.

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