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51. decision on/against 做/不做的决定，如： A decision on this matter is pending. 此事即将作出决定. The committee reversed its decision on import quota. 委员会取消了对进口货物的配额的决定。 52. decrease in sth 的减少，如： A decrease in signal power as measured between two points. 信号能量在两点间测量出来的减小量。 There has been a steady decrease in population in this city. 这个城市的人口在持续下降。 53. defence against 防御,保卫，如： Trees are a defence against the wind. 树是一种防风物。 The country put up a strong defence against the enemy s invasion 为了抵制敌人的侵略,这个国家布置了坚固的防御工事 54. delegate to 参加的代表，如： He was elected as a delegate to the annual conference. 他被选为年会代表。 55. demand for 对的需求，如： Demand for hospital services remained high. 居民对医院服务的需求仍然殷切。 A fall in demand for oil tankers has put/placed thousands of jobs in the shipbuilding industry in jeopardy. 油轮需求量下降使造船业成千上万的工作职位受到威胁. 56. departure from 离开，如： | 
