a wall built across a river which stops the river's flow and collects the water , especially to make a reservoir (= an artificial lake ) which provides water for an area
发音
例句
1. The villagers went at building a dam with a will. 村民们劲头十足地着手修一座水坝。 2. The Aswan Dam helps to control the River Nile in Egypt. 阿斯旺水坝有助于控制埃及的尼罗河。