1·The parenthesis around each digit grouping is vital-it allows us to refer to the matched characters inside those parentheses in the corresponding property.
每个数字组周围的括号非常重要，通过它可以在相应的属性中引用这些括号内的匹配字符。
2·The last token read (closing parenthesis) is not the cause of the error.
最后一次符号读取(结束括号)并不是这个错误的根源。
3·Expressions must not begin with an operator, comma, or closing parenthesis.
不可以用操作符、逗号或闭括号作为表达式的开始符。
4·All binary operators except. period and left parenthesis and left bracket should be separated from their operands by a space.
所有的二元操作符，除了。点和左括号和左方括号应用空格将其与操作数隔开。
5·The configuration parameters that control the sizes of these memory pools are shown in parenthesis.
括号中显示了控制这些内存池大小的配置参数。
1·Now by omitting parenthesis, the code can become a little clearer as shown below.
现在通过忽略圆括号，代码变得更清晰了。
2·Named parameters without parenthesis.
没有圆括号的命名参数。
3·Within a pattern, parenthesis indicate a group (as shown in Listing 2).
在模式内，圆括号表示一个组(group)，如清单2中所示。
4·The marker's first number represents time in abstract units; the second optional number enclosed in parenthesis is the number of requests that terminate at this point.
标记的第一个数字表示以抽象单位计算的时间；第二个使用圆括号括起的可选数字表示在该点终止的请求数。
5·Sometimes you need to group sub-expressions with parenthesis, but don't want the parenthesis to spit out another marked sub-expression, in this case a non-marking parenthesis ?
有些时候你需要使用圆括号对子表达式分组，但是却不想这个括号里面的内容再作为标示子表达式，在这种情况下可使用非标示圆括号？