If your arm stretches too far to the side or reaches too far forward, the ball will fall out.

如果你的胳膊向前向两侧伸展过长，球就会掉落在地。

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There are moments in a match when the ball hits the top of the net, and for a split second it can either go forward or fall back.

网球比赛中，有一种情况叫“擦网球”，那一瞬间，球可能弹过网也可能被弹回。

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Bridgestone has risen to second in U.S. golf-ball sales by exploiting a niche in low-compression balls, but any new short-ball designs will require a bundle of new techniques and processes, the best or most efficient of which could fall under a competitor's patents.

WSJ: Why a Ball Rollback Might Not Fly | Golf Journal by John Paul Newport