This research aims at showing the different effects of training arrangement during junior tennis training about the arrangement of balance training.
本研究旨在考察青少年网球训练安排中，平衡训练内容在训练课中安排的不同对于训练效果和青少年平衡能力的影响。
The company is specializing in producing competing used tennis balls, professional training tennis balls. American style wall balls, junior promotion ball and so on.
本公司专业生产比赛网球、专业训练网球、美式壁球、青少年晋级用球等…
应用推荐