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Lung tissue observation results. a shows the pathological changes of lung tissues in the MV group (mechanical ventilation with normoxia group); b shows the pathological changes of lung tissues in the HMV group (mechanical ventilation with hyperoxia group); c shows the pathological changes of lung tissues in the HMV + DFO group (mechanical ventilation with hyperoxia group+DFO). As compared with the HMV group, the lung injury was greatly alleviated
