乒乓球世界冠军张继科右2/3台运用反手侧拧接发球的效果研究
핑퐁구세계관군장계과우2/3태운용반수측녕접발구적효과연구
Effectiveness of Receiving Service with Side-Twisted Backhand at Right 2/3 Table for Table Tennis World Champion Zhang Jike