以下为句子列表：
英文: The huge Tube Expander for Heat Exchanger of Air Con ditioner and Refrigeration System are developed first by our institute after stu dying for a long time.The tube expanding from manual-operation to automatic-oper ation is solved to keep fin at a large d
中文: 在我院多年开发胀管机的基础上，首次研制成功空调制冷换热器超大型胀管机，解决了大片距换热器由手工胀管转变为机械胀管的难题。
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