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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.
youdao
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关键字搜索会返回包含这些变化的文档。
Documents that contain such variations are returned for a keyword search.
youdao
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关键字搜索会返回包含这些变化的文档。
Documents that contain such variations are returned for a keyword search.
youdao