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词汇 upgrading and updating
释义 upgrading and updating
基本例句
升级换代
Fourth, consumer goods have been updated and upgraded.四是消费品档次升级换代。
Rapid replacement and updating of various fire-control radars followed the breakthrough of airborne AESA technlogy.机载相控阵技术的突破,引发了多种型号战斗机的火控雷达升级换代。
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