您是否曾经想知道哪个联网接口是可用的，但是在不回复到本机代码的情况下又不知道该如何询问呢？
Have you ever wanted to know which networking interfaces were available, but didn't know how to ask without reverting to native code?
编写代码询问时区或与GMT的时差，然后根据这一信息提供问候语。
Write code that asks for a time zone or the offset from GMT, and then develop greetings based on that information.
他修改了一段代码，我们想来询问一点具体情况。
Sally: He made a code change and we need to ask him for more information.
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