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已知多种因素可产生镇痛作用,其中有些因素产生的镇痛有阿片受体参与,有些则否。例如小鼠遭到同类的反复攻击时会产生镇痛,这种作用可被纳洛酮对抗。当小鼠仅仅受到攻
A variety of factors are known to produce analgesic effects. Some of these factors include opioid receptors for analgesia and some do not. For example, mice are given similar analgesic attacks, which can be countered by naloxone. When mice are only attacked