Get a set of elements containing the unique parents of the matched set of elements.

取得一个包含着所有匹配元素的唯一父元素的元素集合。

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Use an optional expression to filter the matched set. Only the immediately previous sibling is returned, not all previous siblings.

可以用一个可选的表达式进行筛选。只有紧邻的同辈元素会被匹配到，而不是前面所有的同辈元素。

youdao

Get a set of elements containing all of the unique siblings of each of the matched set of elements. Can be filtered with an optional expressions.

取得一个包含匹配的元素集合中每一个元素的所有唯一同辈元素的元素集合。可以用可选的表达式进行筛选。

youdao

If total costs fall more than five per cent compared with those of a matched set of control patients, the program allows institutions to keep part of the savings.

NEWYORKER: The Hot Spotters

They then got hold of another collection of movie recommendations, from the imdb Web site, and did the math to show that if a set of imdb ratings was big enough, and matched one from the Netflix data set, they were probably from the same person.

FORBES: Digital Tools

Both players were evenly matched throughout the opening set, Kafelnikov only taking the advantage 8-6 in the tiebreak.

BBC: Kafelnikov nets President's Cup