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
应用推荐
模块上移
模块下移
不移动