n.潮水；受海潮影响的河水；低洼的海岸
The marks record the height of the tidewater. 记号标明了潮水的高度。
The ocean waves were shining and moving under my feet, and the tidewater was coming up little by little. 海浪一波一波地在脚下漾着粼粼的波光，潮水渐渐地涨上来。
