He is determined to make sense of those four numbers in some kind of a sequence, and this is what he came up with finally.

他决定要搞清楚这四个数字,在某些序列中的意思，这也是他最后提出来的。

麻省理工公开课 - 固态化学导论课程节选

But we're going to see, very shortly, that in fact those collections could be arbitrary.

是一个整数的序列，我们可以认为它是按照数字依次来的。

麻省理工公开课 - 计算机科学及编程导论课程节选