你可以搜索包含特殊关键字的评论，当然你也可以在RSS中寻找结果。

You can search for comments containing particular keywords and, of course, subscribe to your search results with RSS (or by E-mail).

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保持对一个特殊的文档中多个关键字的跟踪。

You keep track of multiple keywords in a special document.

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默认指定的子句可以为一个常量、一个特殊的寄存器、另一个全局变量、一个表达式或关键字 NULL。

The default clause specified can be either a constant, a special register, another global variable, an expression or the keyword NULL.

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