flap

拍打英释vvto move or to make sth move up and down or from side to side, often making a noise

拍打，拍动英释nnthe noisy movement of something such as cloth in the air

The wings of the bird still ______ after it had been shot down.句意： 鸟被射落后， 翅膀仍在拍动。slap： 拍击， 掌击； scratch： 抓， 擦伤； fluctuate： 波动， 动摇。314fluctuated

1 skin flap,皮瓣

2 pocket flap,袋盖

3 valve flap,阀瓣

4 flap gate,铰链式闸门；舌瓣闸门；翻转板

5 flap valve,瓣阀；片状阀

6 flap wheel,翼片砂轮

1 The sails flapped in the breeze..风帆在微风中摆动。

2 the flap of the sails.船帆的拍动