n. any broad thin and limber covering attached at one edge; hangs loose or projects freely
n. the motion made by flapping up and down
n. a movable piece of tissue partly connected to the body
n. a movable airfoil that is part of an aircraft wing; used to increase lift or drag
n. 飘, 摆动, 拍打, 拍打声, 片状垂悬物
v. 拍打, 鼓翼而飞, 飘动
1. The bird began to flap its wings to take off.
那只鸟开始拍打翅膀准备起飞。
2. She used a paper fan to flap away the heat.
她用纸扇扇走热气。
3. The flag will flap in the wind all day long.
旗帜会在风中飘动一整天。