This lets you search for exact phrases, "all these words", or one of the specified keywords by entering search terms into the appropriate box.

它可以让你搜索更加精准的词组，“所有词组”或者是适当的搜索框里输入词组的某一个特定关键词。

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If any of those keywords are not specified, the defaults are used.

如果其中任何一个关键字未被指定，则使用缺省值。

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Unless otherwise specified, failure to observe a prescription of this specification indicated by one of the keywords must, required, must not, shall and shall not is an error.

除非另有规定，如果不能遵守 “一定、必需、绝不是，应该，不应该” 这些关键词标明的规范的规定，那么算作一个错误。

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