1. on the average (=on average, on an average) 平均

2. (be) aware of (=be conscious of , having knowledge or consciousness)意识到,知道.

3. at the back of (=behind) 在…后面

4. in the back of 在…后部(里面); on the back of 在…后部(外面); be on one’s back(=be ill in bed) 卧病不起.

5. at one’s back(=supporting or favoring sb.) 支持,维护; have sb. at one’s back 有…支持, 有…作后台

6. turn one’s back on sb. (=turn away from sb. in an impolite way) 不理睬(某人),背弃,抛弃

7. behind one’s back 背着某人(说坏话)

8. be based on / upon 基于

9. on the basis of 根据…, 在…基础上

10. beat…at 在…运动项目上打赢

11. begin with 以…开始. to begin with (=first of all) 首先, 第一(经常用于开始语)

12. on behalf of (=as the representative of) 以…名义

13. believe in(=have faith or trust in; consider sth./sb. to be true) 相信,依赖,信仰.

14. benefit (from) 受益,得到好处.

15. for the benefit of 为了…的利益(好处)

16. for the better 好转

17. get the better of (=defeat sb.) 打败, 胜过.

18. by birth 在出生上,论出身,按血统 at birth 在出生时; give birth to 出生

19. blame sb. for sth. 因…责备某人 . blame sth. on sb. 把…推在某人身上

20. in blossom开花(指树木) be in blossom开花(强调状态) come into blossom开花(强调动作)