下面列出了几个用于评估排序活动性能的关键公式
Several key formulas are listed below for evaluating the performance of the sort activities
如同在初版里，每章以“演讲书”形式以及目标包含它的题目的赠送，一个概要，关键公式，实践练习和一次试验。
As in the first edition, each chapter contains a presentation of its topic in "lecture-book" format together with objectives, an outline, key formulae, practice exercises, and a test.
公正地说，查找包含关键字的文档列表是件很容易的事情，但是，排序技术却涉及到很多未知的技术和深奥的计算公式。
To be fair, finding the list of documents that contain the keywords is the easy part, while ranking techniques still involve a lot of black magic and secret evaluation formulas.
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