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】受验者随,一半接受美沙酮的
,另一半每天接受注射二乙酰吗啡,主要成
是海洛因【为海洛因的主要成
】。