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1·The gulls flew off, wings flapping.

海鸥扑打着双翅飞走了。《牛津词典》

2·As feathers became larger over time, flapping flight evolved and birds finally became fully air-borne.

随着时间的推移，羽毛变得越来越大，扑翼飞行逐渐发展，鸟类最终完全可以在空中飞行。

3·She walked up and down, flapping her arms to keep warm.

她来回走动，挥动着双臂使身体暖和起来。《牛津词典》

4·He tried to tuck his flapping shirt inside his trousers.

他试图把飘动的衬衫塞进他的裤子里。《柯林斯英汉双解大词典》

5·The eagle can soar without flapping their wings.

老鹰无需振翼就能翱翔。

6·They return to the Old World still flapping their arms in frustration.

他们回到旧世界，仍然沮丧地挥舞着手臂。

7·The poor young ravens lay upon the ground, flapping their wings, and crying: Oh, what helpless chicks we are!

可怜的小乌鸦躺在地上，拍着翅膀，叫道：“噢，我们是多么无助的小雏鸟啊！”

8·Because they were bipedal, their arms were free to evolve flapping flight, which cannot be said for other reptiles of their time.

因为它们是两足动物，它们的手臂可以自由地进化出拍打的翅膀，这在当时的爬行动物中是不可能的。

9·The two insects have complex flight mechanisms with major muscles in the thorax, the chest region, which power the flapping of wings.

这两种昆虫的飞行机理比较复杂，胸部长有较多肌肉，这样它们才能有力量振动翅膀。

10·Angry Birds is flapping from touch screens to big screens, books and toys. Will one of the best-known mobile apps become an entertainment franchise?

“愤怒的小鸟”已经从触屏手机飞到了电影院、图书和玩具上，那这个最出名的手机应用程序之一会不会成为娱乐产业呢？

(1)skin flap皮瓣

(1)pocket flap袋盖

(1)valve flap阀瓣

(1)flap gate铰链式闸门；舌瓣闸门；翻转板

(1)flap valve瓣阀；片状阀

(1)flap wheel翼片砂轮