投球无变向失效投出的球挂飞变向或落点失效未能按投者的意图变换方向或落地起步慢迟缓投不出变向球悬投一个曲线球或变向球失效
If the ball is thrown without changing direction, it is invalid. If the thrown ball flies, changes direction or the landing point is invalid. If the direction is not changed as the pitcher intends or the landing start is slow and sluggish, the ball cannot be thrown with a change direction. If a curveball is suspended or the change direction ball is invalid
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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