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.

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。

youdao

Each element in a WSDL document can be considered a candidate for a variation point.

可以将WSDL文档中的每个元素视为候选可变点。

youdao

The council document said following more detailed investigations a "variation" - or difference between the agreed price list, called the the "schedule of rates" - and the actual amount charged by MITIE was found.

BBC: Birmingham Council House

These records, together with the monthly mass balance measured since March 2000, document the annual response of the Martial Este Glacier to the climate variation.

UNESCO: Dublin Core