An element of a set that when added to any other element in the set produces a sum identical with the element to which it is added.

零元素：集合中的一个元素，当它加上集合中的任何一个元素时，得到的数值等于被加元素值。

youdao

A rule of correspondence established between sets that associates each element of a set with an element in the same or another set.

映象一种集合间一一对应关系的规则，一个集合中的每个元素与同一或另一集合中的一个元素相对应。

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Peacock feathers should never be brought on stage, either as a costume element, prop or part of a set as chaos will ensue.

孔雀羽毛应该永远不带上舞台，不能作为服装元素，道具或者布景的一部分，否则混乱将接踵而来。

youdao

This was the Rooney that Capello will have wanted to see after a red card in Manchester United's defeat at Fulham prompted the England coach to label his striker "a crazy man" - with no tantrums at Wembley, only an exhibition of the gifts that make him such a vital element of the international set-up.

BBC: England 4-0 Slovakia

In practice, that element of a post-independence referendum is set aside.

BBC: Royal role in independence debate

The president's meeting and conversation with Betty Currie on Sunday, January 18 is a central element in the allegation of obstruction set forth in Article II, and you will hear more about that from Cheryl Mills today.

CNN