Objective: To explore the relation of squmamous papilloma of the esophagus( SPE) and precancerous lesion of the esophageal cancer( PEC).是什么意思_Objective: To explore the relation of squmamous papilloma of the esophagus( SPE) and precancerous lesion of the esophageal cancer( PEC).在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句