You don't see strings with commas between them, but it has the same kind of property. It is in ordered sequence of characters.

它是有序的字符序列,我们可以对字符串做同样的操作,我们也可以得到字符串中的一块。

麻省理工公开课 - 计算机科学及编程导论课程节选

But I can also ask for parts of this. So I can, for example, say give me the first element of s1 string 1, s 1. Ah, that's exactly what we would have thought if this was represented as an ordered sequence of things.

然后返回一个长字符串，我也可以，取字符串的一部分，例如,我可以要求返回给我字符串,的第一个元素，啊，这证明我们之前,认为的它是一个有序的字符序列的想法。

麻省理工公开课 - 计算机科学及编程导论课程节选