Question

http://v.ku6.com/show/QWCphRtZKpMwAuPO.html 这个视频短片的英文和翻译。谢了。

Answer 1

When a bird flies, its wings make two kinds of movements:
当一只鸟飞翔时，它的翅膀在做两种运动：
The inner part of the wings moves up and down, the outer part moves in a circle.
翅膀的根部上下运动，尾部圆形运动。
On the down stroke, the wing feathers overlap so no air can pass through; the wings push air downward and back, propelling the bird through the air.
在向下拍时，羽毛重叠，不让任何空气通过；翅膀将空气向下推，再返回原位，将鸟在空中推进。
On the up stroke, the feathers twist open, allowing the air to pass through and making it easier to lift the wing.
在向上提时，羽毛扭转制造缝隙，让空气通过，并且让提翅膀更简单。

When a bird flies, its wings make two kinds of movements: The inner part of the wings moves up and down, the outer part moves in a circle. On the down stroke, the wing feathers overlap so no air can pass through; the wings push air downward and back, propelling the bird through the air.On the up stroke, the feathers twist open, allowing the air to pass through and making it easier to lift the wing.
当一只鸟飞翔时，它的翅膀在做两种运动：翅膀的根部上下运动，尾部圆形运动。在向下拍时，羽毛重叠，不让任何空气通过；翅膀将空气向下推，再返回原位，将鸟在空中推进。在向上提时，羽毛扭转制造缝隙，让空气通过，并且让提翅膀更简单。