Identification of a natural opioid peptide Leu-Val-Val-hemorphin-6 in hepatocarcinoma cells of a patient by LC-MS是什么意思_Identification of a natural opioid peptide Leu-Val-Val-hemorphin-6 in hepatocarcinoma cells of a patient by LC-MS在线翻译_英语_读音_用法_例句