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Day 2 of qualifying at the 2021 PBA50 National Championship!
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폴로슬루때래인바닥으로부터상채가45도로세워진상태에서는스피너식으로중약지를45도똑같이위로퍼올려투구해야되지않을까요?
폴로슬루때상채가정확히래인바닥과평행상태라면엄지라인도래인바닥과평행으로굴림?즉상채의세워진각에따라엄지라인도같이세워서굴림?