Do you know what is the elevation of Mount Everest? 你知道珠穆朗瑪峰的海拔高度是多少嗎？
Because of the elevation of the lake's surface compared with the river level downstream, a major difference in potential energy exists across a dam. 因為湖水水面的海拔高度，比下游河水的水面還要高，因此在水壩的兩邊有較大的位能差異。
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