When you watch a movie and you see a bird flapping its wings...

Is every bird flapping its wings at the exact same frequency?

每只鸟会以同样的频率扇动翅膀吗？

Investigation of Flapping Wings Lift Characteristics by Unsteady Vortex-Lattice Method

扑翼升力特性的非定常涡格法计算研究

Combined with blade element theory, the results can be used to evaluate aerodynamic characteristics of flapping wings, which are helpful for the initial design of micro rotary and flapping wing.

运用本文方法分析了各参数对翼型气动特性的影响，进一步结合叶素理论还可以估算扑翼的气动特性，进而指导微旋翼或扑翼微型飞行器的初期设计。

Both 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。

The unsteady aerodynamics and the unsteady high-lift mechanisms applied in flapping wings are introduced.

介绍了用于拍动翼的非定常空气动力特性和高升力机理。

It took to the air, flapping its wings in his face, slowing him, blinding him.

它振翅而飞，翅膀拍打着他的脸颊，减缓他的速度，遮蔽他的视线。他不由得在空中摇摆不定。

The lift of flapping wings is measured by the force-measuring device.

通过分析测力系统的动态特性及受激励后的响应，得到扑翼产生的周期升力。

Birds flapping their wings furiously to gain height.

鸟儿拼命使劲扑动双翅往上飞。

A human in a hang glider could comfortably take off and cruise around powered by oversized swim-flipper boots-or even take off by flapping artificial wings.

一个人穿上滑翔翼就可以舒舒服服地起飞，然后靠超大的游泳用的鳍状靴子到处飞行——你甚至扑腾几下人工翅膀也能飞起来。

The winner flew onto the top of the farmhouse, crowing and flapping his wings to let the worle know he was the new king.

得胜的公鸡飞到农舍屋顶上，拍打着翅膀喔喔啼叫，让人们知道他是新王。

Look at the eagle flapping its wings, it's mine.

看那只振翅飞翔的鹰，那是我养。

I wallow in sounds of flapping wings

我在扇动双翼的声音中沉溺

Measurement and analysis of lift of micro air robot with flapping wings

扑翼式微型飞行器的升力测量与分析

The micro flying robot with flapping wings is a bionic flying vehicle, which would find its extensive application for military and civilian purposes. At present, it has become a very active area of research in the world.

微型拍翅式飞行机器人是一种仿生飞行的飞行器，其在军事上和民用上均具有广阔的应用前景，它已成为目前国际上的研究热点之一。

Farm tool and machine cleaning.

清洗农用工具及机械。

A farm tool having one or more heavy blades to break the soil and cut a furrow prior to sowing.

一种农具，有一个或多个重的刃片在播种前来破开土壤制成犁沟。

Tractor and farm tool necessary ability and energy conservation relations.

拖拉机与农具配套能力与节能型方向的关系。

The Dutch guilder was retired in 2002, when it was replaced by the Euro.

荷兰盾在2002年停用，被欧元取代。

To exert much effort or energy.

使出很多的努力或精力。

Ultimately, based on the above analysis, exert effort to put forward the related suggestions on our country strategic tax refund for exports policy.

在上述分析的基础上，对今后我国出口退税政策的完善提出了相关的建议。