单词knuckle ball
na.: 【棒】指节球网络: 蝴蝶球;弹指球;慢速变化球
【棒球】指节球,指关节球
不旋转球
The knuckle ball is an extremely slow pitch, but can be very effective due to its lack of predictability.
指节球是相当慢的投球,但也是非常有效的,因为它缺乏预知性。