The open/close parentheses denote a function that takes no parameters.

开始/结束括号表示一个不带参数的函数。

youdao

Next, type an open quote mark inside the parentheses.

然后在圆括号内输入左引号。

youdao

Annotation forms include glyphs placed in open or solid circles, squares, parentheses, diamonds or rounded boxes.

批注格式包括放在开环或闭环、正方形、括号、菱形或圆形框中的标志符号。

youdao

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