2. a fraction of 一部分
3. a matter of concern 焦點(diǎn)
4. a series of 一系列,一連串a(chǎn)bove all 首先,尤其是
5. absent from不在,缺席
6. abundant in富于
7. account for 解釋
8. accuse sb. of sth.控告
9. add to增加(add up to)
10. after all 畢竟,究竟
11. agree with同意
12. ahead of time / schedule提前
13. ahead of 在...之前(ahead of time 提前)
14. alien to與...相反
15. all at once 突然,同時(shí)
16. all but 幾乎;除了...都
17. all of a sudden 突然
18. all over again 再一次,重新
19. all over 遍及
20. all right 令人滿意的;可以
