中国体育总局严格控制运动员的食物来源

<ol class="exp-conent-orderlist" style="margin: 0px; padding: 0px; list-style: none; clear: both; color: rgb(51, 51, 51); font-family: arial, 宋体, sans-serif; line-height: 24px; text-align: justify;"><li class="exp-content-list list-item-2" style="margin: 0px; padding: 1px="1px"  0px="0px"  22px="22px"  42px="42px"  !important; position: relative; min-height: 20px; height: auto; zoom: 1;"><div class="content-list-text"><p style="margin-top: 6px; margin-bottom: 6px;">转与不转发球的下旋发球是核心环节</p></div></li></ol>

<span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Helvetica, sans-serif; line-height: 24px; text-align: justify;">量的关键因素只有一个</span>

<span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Helvetica, sans-serif; line-height: 24px; text-align: justify;">除向下发力之外</span>

<span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Helvetica, sans-serif; line-height: 24px; text-align: justify;">力摩擦会有一部分旋</span>

<span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Helvetica, sans-serif; line-height: 24px; text-align: justify;">练习低抛摩擦，</span>

<span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Helvetica, sans-serif; line-height: 24px; text-align: justify;">感后勤加练习，巩固手感</span>

<span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Helvetica, sans-serif; line-height: 24px; text-align: justify;">不开腰臂腕的协调</span>

<span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Helvetica, sans-serif; line-height: 24px; text-align: justify;">，发球动作一气呵成</span>

<span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Helvetica, sans-serif; line-height: 24px; text-align: justify;">。发好转与不转发球有</span>

<span style="color: rgb(51, 51, 51); font-family: Verdana, Arial, Helvetica, sans-serif; line-height: 24px; text-align: justify;">如果你的下旋不</span>