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这就是机器零件在使用中磨损的原因。
That is why the machine parts wear away during use.
youdao
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那就是机器零件在使用过程中磨损的原因。
That is why the machine parts were wearing away during use.
youdao
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那就是机器零件在使用过程中磨损的原因。
That is why the machine parts were wearing away during use.
youdao