1. The blowhole is a flap of skin that is thought to open and close under the voluntary control of the animal. 
   呼吸孔是一个被认为能在动物自动控制下开启和关闭的皮肤风口片。
2. The flap folds down. 
   帽边可以折下。
3. Any of various extinct flying reptiles of the order Pterosauria, including the pterodactyls, of the Jurassic and Cretaceous periods, characterized by wings consisting of a flap of skin supported by the very long fourth digit on each forelimb. 
   翼龙任一种已灭绝的翼龙目能飞行的爬行动物，包括翼手龙，它们生活在侏罗纪和白垩纪之间的那段时期，翅膀由一块由每个前肢中非常长的脚趾支撑的皮构成
4. To flap, especially wings. 
   振翅，鼓翼扑打，尤指扑打翅膀
5. The flap of an envelope. 
   信封的封盖

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• 1. 三叶皮瓣
  trichiasis 倒睫...trilobed skin flap 三叶皮瓣...triphalangism 拇指三指节畸形
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