什麼是球棒的甜蜜點？
物理學上叫center of percussion的概念：
center of percussion指在說在物體的某一處垂直施力，軸處不受力
詳細概念可以參考下面兩篇文章：
http://www.kettering.edu/~drussell/bats-new/sweetspot.html
http://en.wikipedia.org/wiki/Center_of_percussion
Friday, January 04, 2008
Sweet Spot
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