heavy ball
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他把一个重球和一个轻球同时仍下去。
He dropped a heavy ball and a light ball at the same time.
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保龄球是一项沿木制球道滚动一个重球的游戏。
Bowling is a game played by rolling a heavy ball down a wooden lane.
投掷一个你的手腕可能支持的球比投掷一个重球重要。
Throwing a weight that your wrist can support is much more important than throwing a heavy ball.
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