Interestingly, this ability was affected by the initial direction of motion.
有趣的是，这种能看到两种方向旋转的可能性与观察者最初观察到的旋转方向相关。
A moving object appears to shrink in the direction of motion, as seen by a stationary observer.
固定的观察者来看运动的物体，它在运动方向上似乎会缩小。
On a snowboard, the torso's natural position is more or less perpendicular to the direction of motion.
在单板上，人的躯干大致和运动方向垂直，十分自然。
Scattering: in physics, the change in direction of motion of a particle because of a collision with another particle.
散射：物理学中一个粒子与另一个粒子碰撞时运动方向发生改变的现象。
The piston completes a stroke each time(that)it changes direction of motion.
每当活塞改变一次运动方向时，它就完成了一个冲程。
The direction of motion can be changed by the action of another force on a body.
在物体上作用另一个力，可以改变物体的运动方向。
The high IQ subjects spotted the direction of motion much faster than those with low IQ.
高智商的受试者辨认出移动方向的速度比低智商的受试者更快。
The high IQ subjects spotted the direction of motion much faster than those with low IQ.
高智商的受试者辨认出移动方向的速度比低智商的受试者更快。
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