关键词频率 Keyword Frequency
频率副词 adverbs of frequency ; Frequency Adverbs ; sometimes ; always usually often sometimes seldom never
频率副词和程度副词 Adverbs of Frequency and Degree
邻近词频率效果 neighborhood frequency effect
检索词频率 term frequency
与关键词频率 Keyword Frequency
词的频率 frequency of word
词汇频率概貌 lexical frequency profile
也叫关键词频率 Keyword Frequency
词汇频率 word frequency ; Term Frequency
一张谷歌词频统计图显示，到1993年时，在各类书中，气候变化这一词的使用频率就已经超过全球变暖。
A Google Ngram Viewer chart shows that by 1993 climate change was already more commonly used in books than global warming.
尽管如此，用于排序结果的数学模型通常是常用的 词频/倒排文档频率模型的变体，而对于这种模型，已有很好的研究基础。
Still, the mathematical models used to rank results are usually some variation of the common term-frequency/inversed document frequency model, which is well-mapped territory.
所以，图书馆员有责任保证研究过程能够产生学术价值，而不只是产生关键词频率的列表。
It becomes the responsibility of librarians, therefore, to ensure that the research process is used to generate scholarship of value, instead of mere lists upon lists of keyword frequencies.
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