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《穿线师年鉴》作为USRSA的官方教材.为会员提供了最实用和明确的信息,尤其是《球拍服务详解》一书.包含考取认证最核心的内容,
As an official teaching material of USRSA, “Yearbook of threaders” provides members with the most practical and clear information, especially the “Detailed description of racket service.” It contains the core content of certification,