In this paper,various syntheses of 2,3-dimethylpyrazine are reviewed,which raw materials includes from biacetyl and ethylene diamine,or from 2,3-butylene-glycol and ethylene diamine etc.是什么意思_In this paper,various syntheses of 2,3-dimethylpyrazine are reviewed,which raw materials includes from biacetyl and ethylene diamine,or from 2,3-butylene-glycol and ethylene diamine etc.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句