To start at any other node in the DOM, start the query expression with a variable name that will be associated with that node when the query expression is interpreted.

在DOM中的任何其他节点开始，使用一个变量名开始查询表达式，在解释查询表达式时，变量名将与该节点关联。

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Otherwise, any whitespace in the variable is interpreted as an argument delimiter.

否则，变量中的任何空格都被解释为参数分隔符。

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You must use quotes to set a variable to a lone slash, because an unquoted slash is interpreted as a division sign.

你必须使用引号去设置一个变量为一个长斜杠，因为一个不被引住的斜杠被解释为一个除号。

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