The Canadian researchers randomly assigned about half of the addicts to receive methadone and the other half to receive daily injections of diacetylmorphine, the active ingredient in heroin.
加拿大的研究者对【将】验者随机分组,一半
美沙酮的治疗,另一半每天
射二乙酰吗啡,主
成分是
【为
的主
成分】。