每个嵌套的括号对，从左开始算起，每个左圆括号加一，放在下一个特殊的数字变量中。

Each nested set of parentheses, counting from the left, incrementing at each left parenthesis is placed in the next special, numerical variable. For example.

youdao

if语句里的条件加括号了么？

Do we put parentheses around the condition of an if statement?

youdao

打开电子邮件信息的头部，查找以“Received: from”后接加方括号的 IP 地址 开头的一行。

Open the header of the email message and look for lines that say “Received: from” followed by an IP address in square brackets.

youdao

Before long we'll see that you can actually put things inside those parentheses which make your programs even more useful.

不久之后，你们就可以看到，我们是可以在括号里面加参数的,这些参数可以让你的程序更有用。

哈佛公开课 - 计算机科学课程节选

What I was saying is after you gave your own name, put brackets and then the nickname by which you want me to refer to you.

我刚才说写了你们的名字之后，后面加个括号,写上你们想让我怎么称呼你们。

麻省理工公开课 - 电影哲学课程节选