The National Institute on Drug Abuse estimates that about a quarter of those who try heroin once become addicts and become more likely to die from an overdose.

国家药物滥用研究所估测大约四分之一的人会尝试海洛进而成为瘾君子, 更有可能死于过量注射。

She is the director of the National Institute on Drug Abuse.

她是国家药物滥用研究所所长。

According to the National Institute on Drug Abuse, addiction is a chronic brain disease characterized by a person's compulsion to seek out and use drugs, despite there being harmful consequences.

根据国家药物滥用研究所的说法，成瘾是一种慢性脑部疾病， 其特征是一个人强迫性地寻找和使用毒品，尽管这会带来有害的后果。