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The failure analysis of the high speed roller bit bearing.
高速牙轮钻头轴承的失效分析。
youdao
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In the depths of time, bearing in mind the little bit of happiness and sadness.
于时光深处，铭记一路点点滴滴的快乐与忧伤。
youdao
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In the depths of time, bearing in mind the little bit of happiness and sadness.
于时光深处，铭记一路点点滴滴的快乐与忧伤。
youdao