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.
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.
TIOBE指数是根据搜索引擎对于特定语言的搜索结果来统计的。
The TIOBE Index is calculated based on the number of search engine results for a particular language. Specifically, the phrase + "programming" is used.
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