有符号的除法要耗费更多的时间，因为除法是使最终结果趋向于零的，而移位则是趋向于负无穷。

The signed division will take more time to execute because it rounds towards zero, while a shift rounds towards minus infinity.

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从技术角度而言，正则表达式是表示某种模式的字符串(也就是说，由字母、数字和符号组成的字符序列)，用于定义零或更长的字符串。

Technically speaking, a regular expression is a string (that is, a sequence of characters composed of letters, Numbers, and symbols) that represents a pattern defining zero or more strings.

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这个股票报价服务实现为符号xxx和yyy返回唯一的值，对别的符号则返回零。

This stock quote service implementation returns unique values for the symbols XXX and YYY, and returns zero for anything else.

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