单词forkball
un.: 分指扣球的投球法网络: 指叉球；指叉球系；指叉球投法
复数：forkballs
The splitseam fastball is a slower version of the fastball thrown with the two fingers spread apart, but not as wide apart as the forkball.
分线快球是稍慢一点的快球，投球时两手指分开，但不象指叉球分得那样大。