20. the original species 原有的物种 species (单复数相同)

19. become endangered 频临危险

18. adapt to (改变以)适应 adapt oneself to 使自己适应于 adjust to (调整以)适应

17. be used to sth/ doing sth 习惯于…

16. take measures/steps/action 采取措施

15. harm sb/ do harm to sb/ do sb harm/ be harmful to sb 伤害某人；对...有害=be bad for

do good to sb/do sb good/ be good for/ 　　benefit sb./be of benefit to 对...有好处/益

14. have a bright future 用有一个灿烂的未来

13. ( take sb ) on a tour of... (带某人)游览...

12. we don't do as we say. 我们言行不一。

11. keep/stop/prevent sb from doing sth 阻止…做… keep sb doing sth 使...一直做...

keep (on) doing sth 坚持做某事 protect...from/against 保护...免受...