虽然这个功能很有用，但你可能会觉得它很烦。
While this is auseful feature, some of you might find it irritating.
如果想在流上执行两个操作，每个操作需要不同且不兼容的过滤器，那么这个功能很有用。
This could be useful if you want to perform two operations on the stream, each requiring different and incompatible filters.
这个功能在下面这种情况下很有用：您想在一个目录中更改一个程序或配置文件，然后在另一个目录下的日志文件中查看结果。
This functionality could be useful if you wanted to change a program or configuration file in one directory and see the results in a log file in a different directory.
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