One afternoon, the home-made ball was spinning across the grass when it was suddenly stopped by someone.

一天下午，这个自制足球正在草地上滚动着，突然被人拦住了。

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The key to this is the reduced density of the atmosphere, which affects how fast the ball moves through the air and also the bend of a spinning ball.

此处的关键在于大气的折合密度，它会影响球在空中穿越的速度以及旋转球的弯曲度。

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The forces on a spinning ball that is flying through the air are generally divided into two types: a lift force and a drag force.

空气中运行的旋转球的受力通常分为两种：升力和阻力。

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If you've ever been using some program, you did something completely innocuous, pull something down from a menu, click a button, you didn't do anything wrong and yet all of a sudden the thing just starts hanging there or you get a little spinning beach ball or the hour glass or whatever it is.

如果你之前在用一些程序，做一些无伤大雅的事情，拉下一个菜单，点击一个按钮，你没有做任何错误的事情,突然间有东西开始一直运行,或者一个沙滩上的小球旋转,或滴漏或是别的什么。

哈佛公开课 - 计算机科学课程节选

England roared back down the other end and threatened to score, but after spinning the ball out wide to the right, winger David Strettle was held up over the line -- forcing a decision from the video referee, which went in Wales' favor.

CNN: Welsh edge England in Six Nations thriller

The Accies forward was caught out as Craig Conway found Dixon with his quickly taken set-piece and, when the full-back's low drive struck the legs of goalkeeper Cerny, Daly rose to head the high spinning ball into the net from five yards.

BBC: Sport - Football - Hamilton 1-3 Dundee United

Saints went two ahead when sub Maybury's shot from the left was deflected into the path of May and he showed great skill to knock the spinning ball over Cerny with a flick of his right foot.

BBC: Sport - Football - St Johnstone 2-0 Hamilton