请大神帮我把下面这句长难句分析一下成分.Dependence is marked first by an increased to_英语解答

请大神帮我把下面这句长难句分析一下成分.
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

人气：301 ℃　时间：2019-11-09 14:09:35

解答

这位同学你好!这个句子的确挺难,我也是睡不着觉,看了好久,才看出眉目,具体如下：大体结构：主+谓+宾详细结构：Dependence（主语）is marked first by（be marked by是被动语态,作谓语.first副词作状语修饰mark）an i...