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發球問題!!!

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最近睇左本書,果到寫住有逆側旋發球仲有逆上旋發球!!

請問系咩黎..同埋可吾可以教教我點開!?

(吾該用中文用答我)thank you!!!

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Interesting!

I can imagine "逆側旋發球"

However, "逆上旋發球", does it mean "backspin" serve. It seems not possible! :bhuu

Very interesting.

(sorry, I don't know how to type Chinese character in MacBook and I don't have writing pad.)

 

[ 本帖最後由 jf1588 於 2009-2-18 01:07 編輯 ]

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