But when flying forward the air passing over the blade that is advancing to the front of the helicopter (and so into oncoming air) provides more lift than the one that is retreating to the back.

但是当向前飞行时，它的旋翼将转向直升飞机的前方(如此一来，就变成朝向迎面而来的空气)，经过叶片上方的气流将比经过叶片背面的气流产生更大的升力。

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Whether you're aiming for layers of plywood or cardboard or a bale of hay, if that foot-long blade hits an Angle, it could come ricocheting back at you.

不管是几层胶合板、纸板还是一大捆干草，万一飞刀打在不平的表面上，它很可能会朝你自己反弹回来。

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When the film was played back, the saber blade would magically appear.

当电影回放时，剑刃就神奇地出现了。

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If a surgeon used a scalpel enhanced with Smart-Tool technology, the real-time sensor on the blade could sense what kind of tissue it is touching and rely the information back to the doctor.

BBC: Promise of touch technologies