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近几十年来，世界上每年有数百座新水库投入运行，人们把兴建水库作为改善环境和发展经济的手段。介绍世界各大洲水库建设和利用的特点。
In recent decades, hundreds of new reservoirs have been put into operation every year in the world. People build reservoirs as means to improve the environment and develop economy. Describe the characteristics of reservoir construction and utilization on all continents.