二縫線速球是不是有
1.單純二縫線
2.二縫線握法中指施比較多力的卡特球
3.二縫線握法食指施比較多力的伸卡球
伸卡球和卡特球也算在二縫線速球的變化
伸卡球和卡特球的握法也有二縫線以外的握法吧
這樣王建民的伸卡球是哪種握法?
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