当在一个已知的地址构造一个对象时，这会派上用场。
This can be useful for constructing an object at a known address.
用户是否可以注册，以创建自己的用户名，或者名称基于用户的电子邮件地址或其他可能已知的构造(名的第一个字母加上姓)？
Can users register to create their own user names, or are the names based on users' E-mail addresses or some other potentially well-known construct (first letter of first name plus last name)?
通过代码的构造方式，我们现在知道内存地址0001f 574处存储有某种类型的数据。
Because of the way the code is structured, we now know that memory location 0001f574 stores some kind of data.
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