He dropped a heavy ball and a light ball at the same time.
他把一个重球和一个轻球同时仍下去。
Bowling is a game played by rolling a heavy ball down a wooden lane.
保龄球是一项沿木制球道滚动一个重球的游戏。
哎呦！这球很重！
A ball should be big, but not too heavy.
一个球应该是大的，但是不要太重。
In which athletic event is a heavy metal ball thrown?
哪一个项目是将一个沉重的金属球抛出？
这球很重！
这球很重！
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