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青少年选手网球选手成长过程中使用的红色球、橙色球和绿色球系统正在世界范围内大力推广。对于青少年选手和家长们来说,技能发展的指引有哪些呢?
The red, orange and green ball systems used by teenagers tennis players are being promoted worldwide. For young players and parents, what are the guidelines for the development of skills?