As towns gradually expanded, water was brought from increasingly remote sources, leading to sophisticated engineering efforts such as dams and aqueducts.
随着城镇的逐渐扩大，水资源要从越来越远的地方获得，这就需要建造如水坝和引水渠这样复杂的工程。
Tens of thousands of dams, many built before seismic engineering came of age, have the potential to release tsunami-like flash floods in the event of a seismic breach.
成百上千的水坝，很多都建在防震工程学诞生之前，如果地震灾害发生，则很有可能会释放像海啸一样突如其来的洪灾。
Traditional hydroelectricity requires DAMS — massive engineering works that remake local landscapes and ecosystems.
传统水力发电需要建造大坝，然而大坝的建造是一项浩大工程，将改变本地的地貌和生态系统。
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