Drag is the force of air resistance pushing against a ball's motion and slowing it down, while lift is a force causing a ball to swerve off a straight path.

拉力是一种物体在空气中所受到的阻力，它能产生与球运行方向相反的作用力，减缓球的运行速度，而升力则是一种能使物体偏离直线运行轨迹的力。

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All other things being equal, when the ball receives a jolt of energy, it is more likely to drop down a step than to pop up one.

在所有其它因素不变的情况下，当球受到能量的撞击后，它滚下一个台阶的概率要大于跳上一个台阶。

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He is tough (and will not back down from a fight) but plays ball with the neighborhood kids in the field which ajoins Birdy's house.

他很强硬，并且不会在打斗中退缩，却会跟邻居小孩在鸟人家旁边的空地上打球。

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Under the tuck rule, if a passer is in the act of bringing the ball down into his body rather than throwing it and loses control, it is ruled an incomplete pass.

WSJ: NFL could eliminate tuck rule

"It was going to be difficult chasing 200 plus on a track where the ball is going up and down, " said Tendulkar, who was named man of the match and man of the series for scoring 403 runs at an average of 134.5.

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Viewers at home are able to see for the first time where the ball will come down and which player is in the best position to tackle it.

ECONOMIST: Who needs it?