1.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.
1.加拿大研究者对【将】受验者随机分
,
接受
沙酮
,另
每天接受注射二乙酰吗啡,主要成分是海洛因【为海洛因
主要成分】。