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11. a country with high mountains and clean blue lakes 一个拥有高山和干净蓝色湖泊的国家
12. keep it that way 让它保持那个样子
13. separate these things into different groups 把这些东西分成不同类别
14. learn about an organization for recycling clothes 了解一个回收衣服的组织
15. collect old clothes from all over the country 收集来自全国各地的旧衣服
16. cut down trees 砍树 (cut it/them down) 17. allow sb to do sth 允许某人做某事
18. be displayed at the show 在展会上展出
19. limit air and water pollution 限制空气和水的污染
20. depend on its rich natural resources to live 依靠它的丰富自然资源生存
21. these new types of energy 这些新型的能源 22. run out/be used up 用完，耗尽
23. produce little pollution 几乎不产生污染
24. make a difference to sb/ sth 对…有作用，有影响
25. pollute the lakes and rivers 污染湖泊和河流
26. be filled with = be full of 充满；被装满
27. be harmed by pollution 被污染伤害 28. living things 生物
29. have a chance to do sth 有机会做某事
30. a survey on students’ daily habits 关于学生日常习惯的调查
31. use both sides of the paper 使用纸的两面32. recycle empty bottles 回收空瓶子
33. take one’s own bags to the supermarket 带某人自己的袋子去超市
34. do a lot to protect the environment 做很多事来保护环境
35. look nicer with more trees around 有很多树环绕看起来更好
36. reduce dust 减少尘土 37. keep soil in place 保持水土
38. be harmful to our health = do harm to our health = be bad for our health 对我们健康有害
39. 历经千年形成 be formed over thousands of years 40. have a wider use 有更广泛的用途
41. provide us with necessary food and drinks 为我们提供必要的食物和饮料
42. throw them away carelessly 不小心扔掉它们43. if possible 如果可以的话
44. take proper actions to protect our environment 采取恰当的措施来保护环境
45. change for the worse 变得更差 46. go green 保护环境
47. some simple steps to take 一些可采取的简单步骤48. turn off the power 关闭能源
49. use plastic bags 使用塑料袋50. develop a green lifestyle 形成一种环保的生活方式