现在没有摩擦力。
I assume that there is no friction for now.
假设现在没有摩擦力。
Were there no friction, we could not walk.
要是没有摩擦力，我们就不能行走。
If there is no friction at all in this bar, then...
若这棒上没有摩擦力，那么。
If there were no friction, an automobile could not move.
没有摩擦力，汽车就不能开动。
If there is no friction, if there are no other forces, only gravity.
如果没有摩擦力，如果没有其他力，只有重力。
If there were no friction, an object in (motion) would never come to a rest.
如果没有摩擦力，那么一个在运动的物体永远也不会停下来。
That never changes if there is no air drag or air friction of any kind.
它未曾变过,如果没有空气阻力,或任何摩擦力。
Friction resistance can be greatly reduced because no slide way is arranged.
而且其结构可以没有滑道大幅度的减少摩擦阻力。
Friction resistance can be greatly reduced because no slide way is arranged.
而且其结构可以没有滑道大幅度的减少摩擦阻力。
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