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编辑部时常收到不少读者的来信,提出千奇百怪的规则问题,有的连我们也一时难以判断。这次,我们请来了乒乓球国际裁判员蔡老师为大家答疑解惑。
The editorial department often receives letters from quite a few readers and raises a myriad of rules questions. Some of them even find it hard to judge for a while. This time, we invited a ping-pong international referee Cai teacher answering questions for everyone.