弧圈的力度大，回弹角度贴地面是不争的事实，而下旋力度小，回弹角度贴垂直，也是事实

来源: Sir。Long 于 2013-04-03 08:12:01 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.