把它放回河里吧 » River put it back 虽然日子过得很煎熬，但收获确实不少。 » Although times were suffering, but the harvest is indeed a lot.
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After the Colorado river flooded in 1905, it took 1500 workers and half a million tons of rock to put the river back on course.
1905年科罗拉多河泛滥后，1500名工作者用了50万吨石头才把它归位。
We put turbines in the mouth of a river. Then, when the tide comes up, it turns the turbines, and when it runs back towards the sea, it turns them again.
把水轮机放在河口，然后当潮水上涨的时候，它能驱动水轮机，而退潮时，又能驱动水轮机。
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