您要查找的是不是：
- 人們早已知道內源性阿片肽（Endogenous Opioid Peptide，EOP）及阿片受體的存在，并已認識到其在中樞鎮痛、中樞心血管功能調節等方面的作用。The existence of Endogenous Opioid Peptide (EOP) has been known for a long time, and it has been recognized that EOP has a central paregoric effect and can regulate cardiovascular functions.
