1)they decide to plant more trees to prevent soil erosion. (他们决定种更多的树以防土壤受侵蚀。)

　　2)they protested strongly against erosions of civil rights. (他们强烈抗议对公民权的侵害。)

　　9.drought n. 干旱季节，旱灾

　　1)the land is in a state of drought. (土地干旱。)

　　2)in many parts of china， people are fighting drought. (在中国的许多地区，人们在抗旱。)

　　请注意区别drought和draught.drought也用作名词，意思是拉，拖，牵引;①被拉的东西，如：that drought was too much for the horse to pull. (那负荷太重了，马拉不动。)

　　②鲜啤酒，散装啤酒，如：give him a glass of draught， please. (请给他一杯散装啤酒。)③一饮的量;吸入，如：he drank the wine in one draught. (他一口喝干了那酒。)

　　10.global adj. 球形的;全球的，世界的;普遍的，总的

　　global是名词globe的形容词形式，-al是形容词后缀，常用在名词后面构成形容词。如regional (局部的，地区的)，emotional (情感的)，seasonal (季节的)。

　　1)the earth is a global mass. (地球是一个球形体。)

　　2)the global economic growth is on the decline this year. (今年总体经济增长呈下降趋势。)

　　3)a global picture of their progress can be obtained from these marks。(从这些分数中你可以得到他们进步的全貌。)

　　4)i`ll try to give you a global idea of the situation. (我将尽力把形势的总体情况告诉你。)

　　5)he makes friends with people from every corner of the globe. (他与来自世界各地的人们交朋友。)

　　11.contribute vt. 贡献;捐助;投稿 　vi. 起作用，有助于;捐献;投稿

　　1)they contributed food and medicine to people in the flooded area. (他们向受淹地区的人们捐助食物和药品。)

　　2)he didn`t contribute any idea to the discussion. (他在讨论中没有提出任何意见。)

　　3)she contributes articles to the newspaper weekly. (她每周为那家报纸撰稿。)

　　4)the two sisters contributed to their mother`s support. (两姐妹合力赡养母亲。)

　　5)i`m sure your suggestion will contribute to solving the problem. (我相信你的建议将有助于解决这个问题。)

　　6)they are determined to make contributions to public safety. (他们决心为公众安全作出贡献。)