The results showed that in the case of having same ratio of soft to hard segment, both the PUD with ionic group in soft or hard segment had better stability.是什么意思_The results showed that in the case of having same ratio of soft to hard segment, both the PUD with ionic group in soft or hard segment had better stability.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句