And that you might look at, for example, that first example, and say, man by this stage it was already sorted, yet it had to go through and check that the third element was in the right place, and then the fourth and then the fifth and then the six.

你可能会去看看例如第一个例子，然后要抱怨，到这里,它已经是排好序的了,但他还是得去遍历查看,第三个元素是不是在正确的位置,然后第四个，第五个，第六个。

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And by the 1820s and 1830s the American South became what I think you could safely say was the fifth slave society in human history; maybe the sixth. This is debatable.

自十九世纪二三十年代起,美国南方,绝对成为了,人类历史上的第五个奴隶社会,也可能是第六个,这仍然处于争议中

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