Swallowtail butterflies have particularly large wings for their body size, and flap them relatively infrequently.
燕尾蝶有着相对于它们的身体而言十分巨大的翅膀，并且扇动的频率少见地慢。
They've never sprinted headlong into a flock of seagulls to watch them flap and scatter.
他们也不曾猛冲入海鸥群中，看着它们振翅四散。
Because their two sets of wings effectively flap as one, that in theory gives them little control over the aerodynamic forces on their body.
因为它们的两副翅膀叠在一起，在空气动力学的理论中，这意味着它们对自己身体缺乏控制力。
The kids would kick them, and the chickens would flap their wings furiously to avoid the brunt of the feet.
然后小孩儿踢一脚，几只鸡就呱呱地扇着翅膀逃走。
Objective To study the anatomy of the blood vessel of the frontal skin flap, especially the anastomosis among them to provide basis for clinical use.
目的明确额部常见皮瓣间供血血管系统之间的吻合情况，为额部皮瓣特别是眶上动脉蒂反流轴型皮瓣的临床应用提供解剖学基础。
Random flap microcirculation and pedicle division timing: Can laser Doppler imaging evaluate them?
随意皮瓣血液灌流与断蒂时机：激光多普勒成像可能评价吗？
The remotely controlled, realistic looking birds actually flap their wings to fly, and in a way that makes them remarkably similar to the real thing.
远程控制，逼真的鸟居然扇动翅膀飞行，并在一定程度上使得它们非常类似于真实的东西。
The remotely controlled, realistic looking birds actually flap their wings to fly, and in a way that makes them remarkably similar to the real thing.
远程控制，逼真的鸟居然扇动翅膀飞行，并在一定程度上使得它们非常类似于真实的东西。
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