This is the problem that reverse search engine optimization resolves.

这是问题的反向搜索引擎优化的解决。

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The library search program uses a new combined forward and reverse search principle.

谱库检索应用新的正、反检结合型原理建成。

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A global reverse index is simply a design where you create a map whose key is the search term, and the value is the list of keys containing an attribute with that search term.

一个全局反向索引仅仅是一个设计，其中创建的映射的键是搜索关键词，且其值是包含属性与搜索关键词的键列表。

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My own advice: do a reverse image search on the photos they send you.

FORBES: Connect

Through a reverse photo search, Schulman discovers that Amanda's pictures belong to someone else.

CNN: TV show 'Catfish' focuses on fake Internet relationships

Big city dwellers do the same thing only in reverse when they take a drive into the country to shop in a quaint little town in search of something unique to buy or an off-the-beaten path restaurant.

FORBES: Is "Shop Local" Just Lazy Marketing?