So binary search, the phonebook example, binary search on the pieces of paper on the white board, why is that?

是二分查找，例如电话簿的例子,对其中的某一页进行二分查找，为什么呢？

哈佛公开课 - 计算机科学课程节选

That the phonebook was sorted alphabetically and that the array of numbers on the board behind the second row of paper itself was sorted alphabetically.

电话簿是按照字母顺序排列的,而且黑板上第二排后面的一系列数字,也是按字母顺排列的。

哈佛公开课 - 计算机科学课程节选

Well recall from week zero when we took a very real world phonebook and then just last week we had our volunteer come up with the array of pieces of paper on the board and when I challenged myself and when I challenged our volunteer to find me the number 50 both he and I were able 50 to leverage one assumption.

大家回忆一下,当我们拿着一个现实世界的电话簿,就在上周我们的志愿者,在黑板上提出了纸片的阵列,我挑战自己，也挑战志愿者,要找出同一个,数字。

哈佛公开课 - 计算机科学课程节选