俺发的好时，感觉速度能上100迈。但不是太稳定。请各位网球大侠看看，给点改进的建议。谢谢
网球发球--征求advice.
影弟 (2011-05-01 20:44:09) 评论 (0)俺发的好时，感觉速度能上100迈。但不是太稳定。请各位网球大侠看看，给点改进的建议。谢谢
海外博客
网球发球--征求advice.
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