dam to make a millpond to provide power for a water mill
milldam详细解释
mill.dam n.（名词）A dam constructed across a stream to raise the water level so that the overflow will have sufficient power to turn a mill wheel.磨坊水坝：横跨溪流建造的堤坝，以提高水位使溢满的水有足够的动力转动磨坊的水轮
