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.
if语句里的条件加括号了么？
Do we put parentheses around the condition of an if statement?
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.
作为例子，我们将要写一个计算由浮点数、圆括号及一些常用的加、减等算术符号组成的算术表达式的程序。
As an example we will write a small program to read and evaluate arithmetic expressions consisting of floating point Numbers, parentheses and the usual operators for addition, subtraction, and so on.
若要使用宏，请将它的名称括在括号内并在前面加一个美元符号 （$），如下所示。
To use a macro, enclose its name in parentheses preceded by a dollar sign ($) as follows.
例如我们要写一个计算由浮点数、圆括号及一些常用的加、减等算术符号组成的算术表达式的程序。
As an example we will write a small program to read and evaluate arithmetic expressions consisting of floating point Numbers, parentheses and the usual operators for addition, subtraction, and so on.
例如我们要写一个计算由浮点数、圆括号及一些常用的加、减等算术符号组成的算术表达式的程序。
As an example we will write a small program to read and evaluate arithmetic expressions consisting of floating point Numbers, parentheses and the usual operators for addition, subtraction, and so on.
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