铁路救援起重机是用于铁路事故救援工作中吊复作业，是保障国民经济大动脉畅通无阻的重要设备。
The railway crane is a kind of important equipment used in rescue operations at railway traffic accidents to ensure the smooth development of the national economy.
他为了作业不出错反反复复和我校对答案，所以他经常不能完成作业。
He seldom finished his work because he repeatedly checked with me to be sure he hadn't made a mistake.
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