但是他们也跟空气阻力作斗争。
这两种力量分别是，空气阻力和冰面摩擦力。
Its is actually acted upon by two forces, air resistance and friction resistance with the ice.
减少空气阻力，从而降低燃料消耗。
大气速度提供举升力和空气阻力。
如果没有空气阻力，可以达到每小时225英里。
Without the air drag, we would have reached 225 miles per hour.
对密度大的货物空气阻力可忽略不计。
The air resistance may be overlooked if the load density is large.
现在是最后一部分，就是，空气阻力如何影响轨道？
Now comes my last part, and that is, how does air drag influence trajectories?
并不糟糕，算上了空气阻力，这甚至不是一个近似值。
That's not bad, so this takes the air drag into account, and it is not even an approximation.
要制造飞机，就必须考虑空气阻力的问题。
Air resistance must be given carefully consideration when the aircraft is to be manufactured.
我无法消除空气阻力。
要制造飞机，就必须仔细考虑空气阻力问题。
Air resistance must be given careful consideration when the aircraft is to be manufactured.
据合理估计，你得到一个弹性碰撞，但空气阻力总存在。
And so to a reasonable approximation, you will get an elastic collision, but, of course, there's always air drag.
我想知道，因为空气阻力，延迟多久以后落地。
I wanted to know how many milliseconds is the touchdown delayed because of the air drag.
网球受到空气阻力。
减少空气阻力最低。
它未曾变过,如果没有空气阻力,或任何摩擦力。
That never changes if there is no air drag or air friction of any kind.
加大空气阻力。
由于类似空气阻力的牵引作用，这些气体的（运行）速度减缓。
The gas was slowed by a drag force similar to air resistance.
当然，当他们打开，降落伞，空气阻力剧增，他们下降的更缓慢。
Of course, then they open the parachute and then the air drag increases enormously and then they slow down even further.
物体在下落一定距离后由于空气阻力都会达到一个终极速度。
The falling object, after traveling a certain distance through the air reaches a final speed, or "terminal velocity," because the object's friction with the air slows the fall.
在空气动力学上，升力是重量，推力和阻力(空气阻力)的相关的函数。
In aerodynamic terms, lift is a function of weight, thrust and drag (air resistance).
这样就加大了空气阻力，并减少了它们着地时冲击力带来的震动。
This increases their air-resistance and reduces the shock of impact when they hit the ground.
与身体分隔的紊乱的空气产生涡流进而造成空气阻力，使得车速下降。
Disrupted air, where the flow 'separates' from the body, creates turbulence which creates drag - which slows the car down.
压制机身获得空气阻力，可能他们(驾驶员)得到的信息是飞行速度太快了。
"You push down on the wheel to gain air speed, perhaps they (pilots) were getting information that the air speed was too high," said Miles o 'brien, a pilot and aviation analyst.
减低汽车行驶中的空气阻力、抑制其行驶时的气动噪声具有十分重要的意义。
It is very important to reduce the aerodynamic drag and noise for traveling vehicles.
而当它们飞舞着接近地面的时候，因为空气阻力的原因，它们会在空中水平漂浮很长时间。
Air resistance then causes these crystals to lie nearly flat much of the time as they flutter to the ground.
一旦旗子被动过，由于月球没有大气，也就没有了空气阻力，它反而要过很久才能停下来。
When it is set in motion, the lack of atmosphere and hence air resistance mean the flag takes a long time to settle.
如果我从100米的楼上跳下去，无重量时间大概是4。5秒，忽略空气阻力不计。
If I jump from a tower which is 100 meters high I will be weightless for 4.5 seconds ignoring air drag.
如果我从100米的楼上跳下去，无重量时间大概是4。5秒，忽略空气阻力不计。
If I jump from a tower which is 100 meters high I will be weightless for 4.5 seconds ignoring air drag.
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