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The air being dragged across the top of the spinning ball moves in the same direction as the air that's rushing past.
球所带起的这层空气旋转到球上方时，它的运动方向与周围气流的方向一致。
As the air spinning with the ball comes around the bottom it is moving in the opposite direction from the air on top, and therefore against the onrushing air.
当这层空气到球底部的时候，其运动方向与上方空气相反，因此与周围气流相抵。
Consequently it's slower than the air on top.
这样会导致下方的空气速度较上方更缓慢。
A slow moving air stream has higher pressure than a fast moving air stream.
缓慢流动的气流比快速流动的气流压强大。
So, the higher pressure on the bottom of the ball is going to hold the ball up longer.
因此，球底部较高的气压可以把球向上托，促使其在空中停留更长时间。
The effect of the dimples is so significant that a drive of two-hundred yards hit with a dimpled golf ball,
这些凹痕的作用十分重要，同样的一杆，如果可以把有凹痕的高尔夫球击出200码，
would be shortened with a non-dimpled ball to about one hundred yards.
那么相同条件下，只能把没有凹痕的球击出约100码。
译文为可可英语翻译，未经授权请勿转载!
