2. 外语
  3. 从技术角度讲，除食品外，任何能改变我们生理和心理机能的物质都是药物。许多人错误地认为“药物”这个词仅指某些药品或嗜毒者服用的违禁化学品。他们没有认识到像酒精、烟草这些熟悉的物质也是药物。这也就是为什么许多医生和心理学家现在使用了一个更为中性的词——物质，他

从技术角度讲，除食品外，任何能改变我们生理和心理机能的物质都是药物。许多人错误地认为“药物”这个词仅指某些药品或嗜毒者服用的违禁化学品。他们没有认识到像酒精、烟草这些熟悉的物质也是药物。这也就是为什么许多医生和心理学家现在使用了一个更为中性的词——物质，他

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问题     从技术角度讲，除食品外，任何能改变我们生理和心理机能的物质都是药物。许多人错误地认为“药物”这个词仅指某些药品或嗜毒者服用的违禁化学品。他们没有认识到像酒精、烟草这些熟悉的物质也是药物。这也就是为什么许多医生和心理学家现在使用了一个更为中性的词——物质，他们常用“物质滥用”而不是“药物滥用”来清楚表明滥用酒精和烟草这样的物质同滥用海洛因和可卡因一样有害。
    在我们生活的社会里，物质(药物)被广泛地使用于社交和治疗：服阿斯匹林来缓解头痛，喝点儿酒来应酬，早晨喝咖啡来提神，吸支烟镇定一下情绪等。使用这些物质得到了社会认可，而且显然具有积极的一面，但什么时候变成滥用了呢?首先，大多数物质使用过量都会产生副作用，譬如中毒或反复使用一种物质可导致上瘾或对该物质(药物)的依赖。依赖的最初表现为耐受力增强，用量越来越大才能达到预期效果，一旦停用就会出现不舒服的停药症状。
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答案 Technically, any substance other than food that alters our bodily or mental functioning is a drug. Many people mistakenly believe the term drug refers only to some sort of medicine or an illegal chemical taken by drug addicts. They don’ t realize that familiar substances such as alcohol and tobacco are also drugs. This is why the more neutral term substance is now used by many physicians and psychologists. The phrase "substance abuse" is often used instead of "drug abuse" to make clear that substances such as alcohol and tobacco can be just as harmfully misused as heroin and cocaine. We live 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. When do these socially acceptable and apparently constructive uses of a substance become misuses? First of all, most substances taken in excess will produce negative effects such as poisoning or intense perceptual distortions. Repeated use of a substance can also lead to physical addiction or substance dependence. 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.
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