B1 to jump into water, especially with your head and arms going in first, or to move down under the water（尤指头和手臂先入水的）跳水；下潜

B1 [ I ] to swim underwater, usually with breathing equipment（通常指携带呼吸设备的）潜水

[ I ] to fall in value suddenly and by a large amount突然大幅贬值，暴跌

[ I ] to go down very quickly迅速下降，急剧下滑

[ I usually + adv/prep ] to move quickly, often in order to avoid something（为躲避而）冲，奔，扑

[ I ] in football, to fall down deliberately without another player causing you to fall, in order to try to win a penalty or a free kick unfairly（足球比賽中）假摔

B2 [ C ] a jump into water with your head going in first（尤指头和手臂先入水的）跳水

[ S ] a sudden loss in value突然的大幅贬值，暴跌

[ C ] a movement down onto the ground俯冲

[ C ] in football, the action of falling down deliberately without another player causing you to do so, in order to try to win a penalty or free kick unfairly（足球等比赛中的）假摔

[ C ] a sudden quick movement（突然间的）冲，奔，扑

[ C ] informal a restaurant, hotel, bar, or place for entertainment or social activities that is unpleasant because of the condition of the building or the type of people that go there低级的餐馆（或酒店、酒吧、娱乐场所）