The syntax used in Listing 2 should be fairly easy for most developers to understand: using parenthesis to delimit groupings, | characters to indicate choices between alternatives, and?
清单2中使用的语法对于大多数开发人员而言是非常容易理解的：使用圆括号来划分组，使用|字符表示备选项，以及使用？
A blank space should not be used between a function value and its left parenthesis.
函数参数与左括号之间不应该有空格。
There should be no space between the name of a function and the left parenthesis of its parameter list.
函数名与((左括号)之间不应该有空格。)
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