这是常规using指令的作用.例如:

That's what the normal using directive does. For instance:

using System;

表示您可以无限制地使用Console，Guid，Int32等.与Java中单个导入最接近的等效项是:

means you can use Console, Guid, Int32 etc without qualification. The closest equivalent to the single import in Java is:

using Console = System.Console;

(等)

但这并不经常使用.