指定如果有多于一个匹配存在，任意匹配都是可接受的结果： 仍会寻找最左匹配，但可能不会寻找那个位置的“最佳”匹配。
Specifies that if more than one match is possible then any match is an acceptable result: this will still find the leftmost match, but may not find the "best" match at that position.
最近邻算法可被扩展成不仅仅限于一个最近匹配，而是可以包括任意数量的最近匹配。
The Nearest Neighbor algorithm can be expanded beyond the closest match to include any number of closest matches.
包含一个简单选择符的选择符，匹配任意符合它要求的元素。
A selector consisting of a single simple selector matches any element satisfying its requirements.
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