1. cause=reason=factor=origin=root 原因 n.
2. measure=weigh=time=take=read 测量 v.
3. route=motorway=highway=expressway 车道 n.
4. exclude=omit=miss out=leave out=drop 排除在外 v.
5. renewable=sustainable=recycling=environmentally friendly 可再生的 adj.
6. exist=there is/are=be found=occur 存在 v.
7. limit=restrict=constrain=confine=keep to 限制 v.
8. boundary=border=edge=outskirts=frontier 边界 n.
9. allow for=make sth. Possible 使…成为可能
10. proposal=suggestion=recommendation=proposition 提议 n.
11. urban=city=town=municipal 城市的 adj.
12. odour=smell=stench=stink 味道 n.
13. find one's way=navigate 导航 v.
14. bearing=position=standing 方位 n.
15. exchange=share=distribute 分享 v.
16. waste=unwanted materials=rubbish=garbage=trash 废物 n.
17. dental=teeth 牙齿的 adj.
18. priority=preferential=the most important=overriding 优先 n.
19. encourage=promote=help=support=be supportive 鼓励 v.
20. explore=look for=discuss=think 探索 v.
21. factor=cause=reason=root=origin 因素 n.
22. cultivate=grow=raise 培养 v.
23. convert=modify=transfer=adapt=customize 转变 v.
24. digest=take in=absorb=assimilate 消化 v.
25. preserve=protect=keep=store=keep sth. In storage 保存，保护 v.
26. monitor=watch=keep an eye on 监视 v.
27. allocate=distribute=apportion=grant=confer 分配 v.
28. decline=decrease=reduce=fall=drop 下降 v.
29. fragile=weak=delicate=breakable=feeble 脆弱的 adj.
30. upgrade=improve=make sth.better=make improvements 改进，提高 v.
31. advanced=developed=sophisticated=high-tech 先进的 adj.
32. sustainable=renewable=recycling=environmentally friendly 可持续的 adj.
33. evidence=proof=documentation 证据 n.
34. long-standing=lengthy=long-running=lasting 长期的 adj.
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