Comparison of Analgesic Effects of Tramadol and Fentanyl Used for Patient-controlled Intravenous Analgesia After Off-pump Coronary Artery bypass Grafting是什么意思_Comparison of Analgesic Effects of Tramadol and Fentanyl Used for Patient-controlled Intravenous Analgesia After Off-pump Coronary Artery bypass Grafting在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句