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。

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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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The RUP-SE framework is one element of a comprehensive set of systems development lifecycle management principles, best practices, methods, and tools.

RUP-SE框架是一个系统开发生命周期管理基本原理、最佳实践、方法和工具的全面集合中的一个元素。

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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

Garcia-Lopez finally found an element of consistency at the beginning of the third set and had Murray scampering all over the court to retrieve a series of well-placed groundstrokes.

BBC: Australian Open: Andy Murray crushes Garcia-Lopez