We've looked so far really at two non-scalar types. And those were tuples written with parentheses, and strings.

关于这两种基本类型我们已经,学的相当多了,包括哪些元组和字符串类型。

麻省理工公开课 - 计算机科学及编程导论课程节选

And if it sees S-W-A-P, open parentheses, close parentheses, and it hopefully sees two ints inside of it, that's all it needs to do in order to finish compiling your code.

如果它看到了SWAP，左圆括号，右圆括号，它可能载里面看到两个int数，那是它所需要做的,用来完成代码的编译。

哈佛公开课 - 计算机科学课程节选