4. We live in a society in which the medicinal and social use of substances (drugs) is pervasive: an aspirin to quiet a headache, some wine to be sociable, coffee to get going in the morning, a cigarette for the nerves.
[参考译文] 我们生活在一种药品(毒品)的医学用途和社会用途都很广泛的社会里： 一片用来止头痛的阿斯匹林，一些用来社交的葡萄酒，早上自己提提神 所喝的咖啡，一支用来定神的香烟。
5. Dependence is marked first by an increased tolerance, with more and more of the substance required to produce the desired effect, and then by the appearance of unpleasant withdrawal symptoms when the substance is discontinued.
[参考译文] 对药品的依赖性首先表现为不断增长的耐药量，要产生想得到的效果所 需要的药品剂量越来越大，然后表现为当停止用药后，令人不快的停药 症状的出现。
