A good algorithm to design such a hierarchical database consists of two steps, first, to describe real world in E-R model and then, convert it to the model supported by the DBMS.

在设计层次型数据库时，一个较好的设计方法是分二步走：首先利用实体联系方法抽象出现实世界的实体联系模型，然后将实体联系模型变换到具体DBMS 所支持的层次型模型。

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They are computationally challenged, meaning, at the time they were invented, they were perfectly good sorting algorithms, there are better ones, we're going to see a much better one next time around, but this is a good way to just start thinking about how to do the algorithm, or how to do the sort.

他们是相当棒的排序算法，是有更好的算法，我们下一次,就会看一个更好的，但是开始想想,如何完成算法，或者说是如何排序,是一个好的学习方法,恩，再试试吧,如何来排序呢？

麻省理工公开课 - 计算机科学及编程导论课程节选

N log N is not nearly as good as log N. As a sanity check, what algorithm have we seen that runs in log N time?

而N，log，N和log，N并不一样，我们之前探讨过的哪个算法其时间复杂度是log，N呢？

哈佛公开课 - 计算机科学课程节选

But like a bad compression algorithm, all they really do is throw away a lot of good information.

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By creating a mathematical algorithm, the charity hopes to predict whether someone could be a good match using the information gathering in initial testing.

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