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一公頃半的樹林 20. produce enough oxygen 產(chǎn)生足夠的氧氣 21. keep… alive 使 ......存活 22. as well as 也 ,同樣 23. for example 例如 24. warn sb (not) to do sth 告戒某人 (不要 )做某事 25. warn sb. of sth. 預(yù)告 / 預(yù)先通知某人某事 26. protect oneself by doing sth. 通過 ......保護自己 27. produce a chemical 產(chǎn)生一種化 學(xué)物質(zhì) 28. make… do sth. 使某人做某事 29. taste nasty 嘗起來令人作嘔的 30. join… together 把 ......連在一起 31. pass … around 傳遞 ...... 32. municate with sb. 和 ......交流 / 交際 33. one another = each other 互相 34. in danger 處于危險中 35. hardly any = almost no 幾乎沒有 36. our best fighters against pollution 我們最好的反污染衛(wèi)士 Sentence patterns 1. Trees cool the air as well as clean it 2. They make streets more beautiful and less noisy. 3. Trees are municating with one another. 三 Language points : 1. on earth = in the world 在世界上 on the earth 在地球上 2. living a. alive now 有生命的 作定語 . He’ s the