social-class background

David Cameron, their leader, trades on his youth as much as Gordon Brown, the prime minister, burnishes his middle-class social background.

保守党首领卡麦隆像英国首相布朗一样利用他的年轻人，把他中产阶级的社会背景弄得光鲜耀眼。

Competition is seen as an open and fair race where success goes to the swiftest person regardless of his or her social class background.

竞争被看作是一个公开、公平的竞赛，胜利总是归于跑得最快的人，而不管他的社会阶级背景。

Social mobility doesn't necessarily undermine class distinctions if the movement between 'layers' results in someone changing their social background.

如果社会“阶层”可以相互转化，并能够改变一个人的社会背景，那么“社会流动性”并不需要消除阶级差异。