1.[c]（附于某物的）片状下垂物，封盖，口盖，袋盖a flat piece of paper, cloth, metal, etc. that is attached to sth along one side and that hangs down or covers an opening
the flap of an envelope信封的封盖
I zipped the tent flaps shut.我拉上了帐篷门帘的拉链。
2.[c][ususing]（上下或左右）拍打，振（翅），拍击a quick often noisy movement of sth up and down or from side to side
With a flap of its wings, the bird was gone.鸟扑打着翅膀飞走了。
the flap of the sails风帆的鼓胀
3.[sing](informal)忧虑；困惑；激动a state of worry, confusion and excitement
She gets in a flap over the slightest thing.极小的事也能令她不安。
4.[sing]公众不同意；群众愤怒；大众批评public disagreement, anger or criticism caused by sth a public figure has said or done
the flap about the President's business affairs公众对总统公务的批评
5.[c]（飞机的）襟翼a part of the wing of an aircraft, on the rear of the wing, that can be moved up or down to control upward or downward movement
1.[t][i]~ (sth)振（翅）if a birdflaps its wings, or if its wingsflap , they move quickly up and down
The bird flapped its wings and flew away.鸟振翅飞去。
The gulls flew off, wings flapping.海鸥扑打着双翅飞走了。
2.[i][t]（使上下或左右）拍打，拍击，摆动to move or to make sth move up and down or from side to side, often making a noise
The sails flapped in the breeze.风帆在微风中摆动。
Two large birds flapped(= flew) slowly across the water.两只大鸟振翅缓缓飞过水面。
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。
A gust of wind flapped the tents.一阵风吹动了帐篷。
3.[i](informal)忧虑；激动to behave in an anxious or excited way
There's no need to flap─I've got everything under control.不必担心，一切都已在我控制之中。
The principle is usually illustrated by the fantasy of the flap of a butterfly's wings in Beijing triggering a hurricane in Florida.
这个原理通常是用这样来说明的：假设北京的一只蝴蝶扇动了一下翅膀，就会在佛罗里达引发一场飓风。
I really got into a real flap, "Is it a losing deal for him to marry me? "
不由得心里发慌：他娶我是不是亏了？
She picked up the purse and pointed to the steel YSL on the flap. Believe it or not, I had not noticed it till then.
她拿起钱包指了指外皮上的“YSL”金属标志。不管你相信与否，直到那时我才注意到那个标志。
The work may be a swan with his neck pointed down and his wings raised up for the initial flap of the wings for lift off.
整件作品就好像是一只天鹅，曲著脖子在奋力地拍动著翅膀，不畏艰辛，准备展翅长空。
Twenty minutes later, he scraped off the last bit of glue and with shaking hands he opened the flap.
二十分钟后，他刮掉了最后一点儿胶水，双手颤抖着打开口盖。
Take one body half and, starting at the bottom of the valve, work the end flap of the elastomeric seat into the opening of the body.
拿起一半阀体，从阀门底部开始，将弹性材料阀座的边缘放入阀体的开口处。
I had a great high shapeless cap, made of a goat's skin, with a flap hanging down behind.
我头上戴着一顶山羊皮做的、不成样子的、又高又大的便帽，脑后垂着一块长长的帽缘。
To be able to come a go as they please. A cat flap on your garden door is ideal, if possible.
能够来去自如！如果可能的话，在通往花园的门上装活动猫门是很好的主意。
I, uh, had to leave her skull flap off until the pressure in her brain goes down.
我，嗯，必须让她的头骨一直开着直到她大脑中的压力能够降下来
the bottom part is going to be the flap part of the purse.
底部的部分将成为钱包的皮瓣的一部分。
and a little long hollow place I cut in the in-side of the boat, where I could lay gun, making a flap to hang down over it to keep it dry.
另外，我又在船舷内挖了一条长长的槽，用来放枪，还做了块垂板可盖住长槽，以防枪支受潮。
It has a split-flap system [the kind of system often used in public transport timetables] and there was a problem with one of the flaps.
它里面有一个折片翻页系统[就像是公车时间表经常使用的那种系统]，其中的一个折片出现了问题。
The reverse digital arterial island flap is usually used for finger pulp reconstruction. The technique is simple but effective.
逆行性指侧岛状皮瓣通常应用来做为指腹重建，此步骤简单而有效。
Other parts include a flap which appears to be a giant SIM card cover, but actually opens up to let you look at the circuitry inside.
其他改装包括一个看似像SIM卡盖，但实际上是可以打开以查看内部电路的翻盖。
Results: The frontalis aponeurosis flap suspension was one of methods for correction of complete blepharoptosis.
结果：额肌筋膜瓣悬吊术对于治疗完全性的上睑下垂，可作为上睑下垂矫正术众多选择方法之一。
Local flap is often used for reconstruction of soft tissue defect due to trauma or tumor excision.
因外伤或肿瘤切除后所引起的软组织缺损，时常考虑以局部皮瓣来重建。
it opens it up and the turtle can escape and go up to the top to breathe. Uhm, and then the flap will close behind them.
它就会打开，海龟就能逃离并回到水面呼吸。嗯，然后活门会在它们身后关闭。
We're so good at overcoming our biological limitations -- you know, I flew over here in an airplane. I didn't have to try to flap my wings.
我们擅长于突破生理局限，我坐着飞机来到这里，我不用挥动我的翅膀。
Pycelle pointed with a spotted hand. Where the sleeve of his robe rode up a flap of pale flesh could be seen dangling beneath his forearm.
派席尔用他满是老人斑的手指着，在他卷起袖子露出的前臂下，晃着一条松松垮垮的苍白赘肉。
and for that of a trailing-edge flap, the lift of the airfoil or separating position at the key airfoil element is used.
对后缘襟翼则分别以翼型升力值和分离点位置作为间接目标函数，进行优化计算。
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