如果用频闪相机拍摄，苹果下落的过程，可以看到频闪的间隔，苹果的距离，随着时间不断变大，因为速度随着时间而变大。
So if I strobe this apple while it was falling I would see the separation, when it strobes to increase with time, because the velocity goes up with time.
我们以最快的速度穿梭在广岛狭小的街道上。满目悲凉的城市建筑频闪而过，伴着司机的急打方向盘动作，我们左右摇摆。
The tall buildings of the martyred city flashed by as we lurched from side to side in response to the driver's sharp twists of the wheel.
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