[問題] 投手練習的時候丟很像飛彈的球是什麼?
台鋼翁瑋均在練習的時候 丟一顆很像飛彈的球
丟出去還會有口哨聲 這是什麼球?
我只知道投手會用加重球練習 丟這個有什麼作用?
https://youtu.be/CuNZPuKGl8g?si=MbBEdtTQd-OTpK45&t=4
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