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。
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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