You can either throw the ball or you can run the ball. Those are only two ways.

你要么扔球，要么带着球跑。就这两种方式。

美式足球 - SpeakingMax英语口语达人

You have a tube, a transparent--a tube--a hollow tube, and at the top of the tube you throw a ball through so it whips through the tube and it comes out.

用一根管子,一根透明中空的管子,从管子最上面,你丢进去一个小球,小球迅速穿过管子,飞出来

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