发球;
Serve a ball being one of fundamental technology of tennis ball, the service technology is also the technology that unique factors such as route, placement, speed, trajectory not accepting to Fang Lai Qiu affects.
发球是网球基本技术之一,发球技术也是唯一不受对方来球的路线、落点、速度、轨迹等因素影响的技术。
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