机器人，使用哪个搜索引擎的搜索结果，育苗指数索引网站中最动态创建的内容。

Robots—which search engines use to index sites for their search results—don't index most dynamically created content.

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函数索引不能是内置的代数、指数、对数或十六进制函数。

A functional index cannot be a built-in algebraic, exponential, log, or hex function.

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因为搜索引擎的检索数目常常被用作并不存在的相关性指数的替代者。

This is because search engine size has long been used as a substitute for a relevancy metric that doesn't exist.

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