二氧化硫 Traditional form: 二氧化硫 Pinyin (reading): èryǎnghuàliú Definitions: sulfur dioxide SO2 Characters: 二 - two; twice 氧 - oxygen 化 - to change, to convert, to reform; -ize 硫 - sulfur Traditional characters: 二 - two; twice 氧 - oxygen 化 - to change, to convert, to reform; -ize 硫 - sulfur