曲球(Curveball)是棒球中的一种球路。握球时食指与中指握在球的外侧缝线处,出手时藉著手腕的顺时针方向旋转与手指的向下施力,使球造成旋转,进而产生垂直向分力,加上重力的作用,会使球在进入本垒板前的垂直掉落幅度远大于快速球。曲球于1870年代首次出现,是相当古老的一种变化球

An animated diagram of a 12-6 curveball

参考

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