- at a stroke一下子;
- at a speed of以…的速度;
- At a low在低谷
- as a token ofadv.作为…的标志;
- angle of a roof屋顶角;
- a stream of一连串的。。。;
- a sea of无限的，很多的;
- a pat on the back鼓励， 赞扬;
- a man of the worldn.通世故的人;
- a large number of很多;
- a horde of一群人
- a heavy investment巨额投资;
- a cappella（音乐术语）无伴奏合唱;
- be a question of成为一个问题
- diplomatic practice外交惯例;
- give someone a ride搭人人
- give someone a push给某人推一下
- give a hand帮助;
- have a corner on独占（某一行业），垄断（某种商品）;
- in a sweatadv.一身大汗，焦急;
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