n. 扁平物;[航] 襟翼;拍打,拍打声;〈口〉不安,恐慌
v. 上下或左右移动、摆动;轻拍;振翅而飞
网络 襟翼; 拍打; 袋盖
When small creatures swim past, they bend the hairs on the bladder, causing a flap to open.
当小生物游过时,它们会弯曲膀胱上的毛发,导致膀胱瓣打开。
Now is your chance to find out! Put both feet in, get in the water, and feel how it is to flap instead of kick.
现在是你发现的机会!双脚都伸进去,入水,感受拍打而不是踢腿的感觉。
Furthermore, the birds orient themselves carefully with regard to the Sun and gently flap their wings to increase convection cooling.
此外,这些鸟会根据太阳的位置谨慎调整自己的方向,并轻轻拍打翅膀以增加对流的降温效果。
The flap of the envelope had come unstuck.
信封的封口没粘牢张开了。
She gets in a flap over the slightest thing.
极小的事也能令她不安。