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。
Much of the time, the fins are sliced off with a blade at sea and the bloody shark torso thrown back in the water to die.
大多数时候，人们在海上用刀把鱼鳍割下来，然后便将血淋淋的鲨鱼躯干扔入海里，任由它们死去。
It cut deep: the edge of the blade reached to the back of his throat.
这一砍砍得极深，锋刃已经触及到喉部后侧。
And I stopped the blade, slicing the air as I pushed him away, letting him fall back to the street.
我停下手里的刀，在空中挥了几下又把他推开。
On our way back I began to realize what benefit the retrieval of this blade ment for the alliance.
返回的路上，我意识到了这把利刃的的寻回对联盟来说的益处是什么。
From the pics we need to grasp the blade when drawing it out or back.
看刀谱图上拔刀出鞘或还刀入鞘手需抓在刀条上。
The second crushing blade (2) is adjusted to move substantially harmonically back and forth along a linear path.
第二破碎刀片(2)被调整成沿着一条线性路径进行实质上谐波式往复运动。
The utility model relates to a back wheel of a spiral plowing farmland tillage tool, which comprises a ring blade, a back wheel made form rubber or other materials, and a back wheel fork.
本实用新型是一种旋耕式农田耕作机械的尾轮。它由环型刀片，胶尾轮或其它材料制成的尾轮，尾轮叉组成。
The motor drives the back of the press blade to move forward and backward via the gears and gear arm to realize the purpose of punching easily and quickly;
由电机通过齿轮、齿臂带动压刀梁作前后运动，达到冲孔轻松、快捷的目的；
The motor drives the back of the press blade to move forward and backward via the gears and gear arm to realize the purpose of punching easily and quickly;
由电机通过齿轮、齿臂带动压刀梁作前后运动，达到冲孔轻松、快捷的目的；
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