1. rely on=depend on 依靠v.
2. avoid=stay away=keep away=steer clear of=make a detour 避免v.
3. die out=extinct=disappear=no longer exist 灭绝 v.
4. hunt=search for=look for=try to find=in search of 打猎v.
5. limb=arm or leg=body=organ 四肢 n.
6. perceive=sense=see=spot=become aware of=observe 感知，感觉v.
7. calculate=measure=work out=figure=estimate=access 计算v.
8. detection=finding=observation 探测 n.
9. coin=invent=make=create=come up with 发明，创造 v.
10. inaccurate=incorrect=wrong=misleading 不精确的 adj.
11. revision=change=shift=reform=alteration 改进 n.
12. downward=fall=drop=downhill 下降的 adj.
13. increasing=soaring=growing=rising 上升的'adj.
14. primarily=mainly=largely=chiefly=principally 主要地 adv.
15. due to=because of=as a result of=thanks to=owing to 因为
16. decrease=reduce=fall=drop 下降v.
17. radical=not traditional=new=unconventional 激进的adj.
18. prior to=beforehand=before=in advance=on the eve of 之前
19. demanding=difficult=hard=challenging=tough 要求高的，艰难的 adj.
