[問題] 一個有關納豆的問題
一直很納悶為什麼納豆發球都發不快
一發平均約180幾而已
二發150~160幾
放慢動作看他的發球也是像條鞭子一樣相當鬆啊
也不可能說他力氣不夠吧
那到底是慢在什麼原因上呢??
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