在本例中，一个包含有一些层叠样式表(Cascading Style Sheet, CSS)语法的字符串被传递给函数，然后jQuery尽可能高效地把这些元素找出来。

In this example, the function is passed a string containing some Cascading Style Sheets (CSS) syntax, and jQuery finds the elements as efficiently as possible.

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也会讨论如何使用样式表、CSS语法、层叠顺序的优势。

I also discuss how to use stylesheets, CSS syntax, and the cascading order to your advantage.

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