The study shows that by hydroxypropyl modification lignin is made polyester ether, it can react with diisocyanates to synthesize polyurethane.是什么意思_The study shows that by hydroxypropyl modification lignin is made polyester ether, it can react with diisocyanates to synthesize polyurethane.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句