... 扭转发球 spin service 发球不转 knuckle service 发球得分 service ace ...
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long knuckle service 发不转长球
knuckle E service 发球不转
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Introduced are the research achievements in improving the service lives of sliding bearing and coupler knuckle, as well as the non destructive inspection for hot cracking in Japan.
介绍日本在提高滑动轴承和钩舌寿命方面的研究成果及车轮热裂的无损检测。
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