97年英语考研阅读这句话我不理解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 substanc

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97年英语考研阅读这句话我不理解Dependenceismarkedfirstbyanincreasedtolerance,withmoreandmoreofthesubstancerequiredt

97年英语考研阅读这句话我不理解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 substanc
97年英语考研阅读这句话我不理解
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.
最后这句意思不是说：当停了药不愉快的表情就消退 了 意思是就高兴呗

97年英语考研阅读这句话我不理解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 substanc

我翻译下这段话你就明白了：

依赖性首先的标志是不断增加的抗性,要使用越来越多的药物来产生理想的效果,然后另外一个标志是当停止使用这种药物的时候,会出现不好的停用症状.

后面and之后的是接着前面的marked的,省略了一些内容,完整的是and then is marked by the appearance of unpleasant withdrawal symptoms when the substance is discontinued.

unpleasant 是形容词修饰withdrawal symptoms的

明白了吗?

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