A descendant selector is represented by a double-slash: //.

后代选择器用双斜线 // 表示。

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When using the descendant combinator, an element selector on the right is selected if it falls anywhere between the tags of the element selector on the left.

当使用后代选择符，右边的一个元素选择器是被选择的，不管左边的元素选择器标签有几个。

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In this case, the selector is the ancestor element name followed by the descendant element name.

在这种情况下，选择符是祖先元素名后面跟着后代元素名。

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