我说一个话题，大家帮我分析一下啊

<div align="left" style="font-family: tahoma, helvetica, simsun, sans-serif; list-style: none; margin: 0px="0px"  auto; padding: 0px; line-height: 21px; word-wrap: break-word; color: rgb(68, 68, 68); "><font face="Arial" style="word-wrap: break-word; ">“</font><font face="宋体" style="word-wrap: break-word; ">包膝盖</font><font face="Arial" style="word-wrap: break-word; ">”</font><font face="宋体" style="word-wrap: break-word; ">摩擦，这就形成了</font></div>

<div align="left" style="font-family: tahoma, helvetica, simsun, sans-serif; list-style: none; margin: 0px="0px"  auto; padding: 0px; line-height: 21px; word-wrap: break-word; color: rgb(68, 68, 68); "><span style="font-family: 宋体; ">，而不是右后方</span></div>

<div align="left" style="font-family: tahoma, helvetica, simsun, sans-serif; list-style: none; margin: 0px="0px"  auto; padding: 0px; line-height: 21px; word-wrap: break-word; color: rgb(68, 68, 68); "><span style="font-family: 宋体; ">的旋转高度落点位置</span></div>

<div align="left" style="font-family: tahoma, helvetica, simsun, sans-serif; list-style: none; margin: 0px="0px"  auto; padding: 0px; line-height: 21px; word-wrap: break-word; color: rgb(68, 68, 68); "><span style="font-family: 宋体; ">球拍像和案子平行。</span></div>

<div align="left" style="font-family: tahoma, helvetica, simsun, sans-serif; list-style: none; margin: 0px="0px"  auto; padding: 0px; line-height: 21px; word-wrap: break-word; color: rgb(68, 68, 68); "><font face="宋体" style="word-wrap: break-word; ">我给学生讲的是时候用</font><font face="Arial" style="word-wrap: break-word; ">“</font></div>

<div align="left" style="font-family: tahoma, helvetica, simsun, sans-serif; list-style: none; margin: 0px="0px"  auto; padding: 0px; line-height: 21px; word-wrap: break-word; color: rgb(68, 68, 68); "><span style="font-family: 宋体; ">这个过程当然是瞬间的</span></div>

<div align="left" style="font-family: tahoma, helvetica, simsun, sans-serif; list-style: none; margin: 0px="0px"  auto; padding: 0px; line-height: 21px; word-wrap: break-word; color: rgb(68, 68, 68); "><span style="font-family: 宋体; ">手，吃住球扔出</span></div>

<div align="left" style="font-family: tahoma, helvetica, simsun, sans-serif; list-style: none; margin: 0px="0px"  auto; padding: 0px; line-height: 21px; word-wrap: break-word; color: rgb(68, 68, 68); "><span style="font-family: 宋体; ">，这样就有了：</span></div>

<div align="left" style="font-family: tahoma, helvetica, simsun, sans-serif; list-style: none; margin: 0px="0px"  auto; padding: 0px; line-height: 21px; word-wrap: break-word; color: rgb(68, 68, 68); "><span style="font-family: 宋体; ">，这样是为了发挥</span></div>

<div align="left" style="font-family: tahoma, helvetica, simsun, sans-serif; list-style: none; margin: 0px="0px"  auto; padding: 0px; line-height: 21px; word-wrap: break-word; color: rgb(68, 68, 68); "><span style="font-family: 宋体; ">，身体重心移</span></div>