phosgeneyoudaoicibaDictYouDict[phosgene 词源字典]
"A colourless poisonous gas made by the reaction of chlorine and carbon dioxide. It was used as a poison gas, notably in the First World War", Early 19th century: from Greek phōs 'light' + -gen, with reference to its original production by the action of sunlight on chlorine and carbon monoxide.[phosgene etymology, phosgene origin, 英语词源]