Most cases with pneumomediastinum are associated with prematurity, pneumonia, meconium aspiration syndrome, difficult delivery or mechanical ventilation.是什么意思_Most cases with pneumomediastinum are associated with prematurity, pneumonia, meconium aspiration syndrome, difficult delivery or mechanical ventilation.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句