后场球没进步？还不是因为肘！小窍门轻松找到反拍发力感觉

#backcourt #backhand #badminton #배드민턴
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Copyright Disclaimer Under Section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, commenting, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing.
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thanks.