She puts a lot of spin on the ball.
她打出的球旋转得很厉害。
He threw it back again, putting a slight spin on the ball.
他把球略带旋转地又投掷了回去。
Pitchers were forbidden to give the ball an artificial spin or trajectory by, for instance, nicking it or spitting on it and from discolouring the ball with dirt or tobacco juice or hair grease.
投手则被禁止发人为旋转或轨线的球,例如给球切口或在球上戳刺,也禁止投手用污垢、烟草汁、头油让球变色。
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