修建这些水坝可提供廉价的电力，为工人创造就业机会，刺激了地区经济发展，并允许在否则将过于干燥的土地上进行耕种。
Building these dams provided cheap electricity, created jobs for workers, stimulated regional economic development, and allowed farming on lands that would otherwise be too dry.
我们需要它来耕种、洗涤、提供电力、控制火灾，最重要的是——供我们饮用。
We need it to farm, to wash, to provide power, to control fires and—most importantly—to drink.
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