As I keep moving down, that part gets smaller, it's not always the initial length of the list, and you're right. But if you do the sums, or if you want to think of it this way, if you think about this more generally, it's always on average at least the length of the list.

等等，随着移动，剩下的部分越来越小，并不是初始那么长了，如果你算一算，或者你这么想，你考虑更一般的情况，平均下来至少是列表的长度。

麻省理工公开课 - 计算机科学及编程导论课程节选

And you could build barricades across smaller streets, but not across big boulevards, and that was part of the rebuilding of Paris in the 1850s and '60s, more about that in a minute and much more about that later, because it's fascinating; at least, I think it's fascinating.

但街垒只适用于小巷,对于大路就不那么适用了,修街垒也算是巴黎十九世纪五六十年代重建的一部分,这个问题我们以后再谈,因为它引人入胜,至少我觉得如此

耶鲁公开课 - 1871年后的法国课程节选