百度作业网请大神帮我把下面这句长难句分析一下成分.
来源：学生作业帮 编辑：百度作业网作业帮 分类：英语作业 时间：2024/07/11 14:14:50
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
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
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 increased tolerance（名词作宾语.increased分词作定语修饰tolerance）
with more and more of the substance required to produce the desired effect（此处是with+n.结构作状语,表示“随着 / 即”.主干是with the substance,required分词作后置定语,to produce the desired effect目的状语修饰required）
and then by the appearance of unpleasant withdrawal symptoms（and是连词,并列连接两个宾语.then是副词作状语,和之前的first对应.by是be marked by结构的那个介词,因为是两个宾语.the appearance of unpleasant withdrawal symptoms名词短语作宾语）
when the substance is discontinued（when引导条件状语从句,表示“当…的时候”,修饰前面的谓语be marked by）
整个句子翻译下来是：依赖性的第一个特点是越来越多的容忍,即越来越多的这种想要达到期望的效果所必须的东西；而当这种东西不复存在之时,将显示出不理想的退步的征状——这是依赖性的第二个特点.
衷心希望帮到你!
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 increased tolerance（名词作宾语.increased分词作定语修饰tolerance）
with more and more of the substance required to produce the desired effect（此处是with+n.结构作状语,表示“随着 / 即”.主干是with the substance,required分词作后置定语,to produce the desired effect目的状语修饰required）
and then by the appearance of unpleasant withdrawal symptoms（and是连词,并列连接两个宾语.then是副词作状语,和之前的first对应.by是be marked by结构的那个介词,因为是两个宾语.the appearance of unpleasant withdrawal symptoms名词短语作宾语）
when the substance is discontinued（when引导条件状语从句,表示“当…的时候”,修饰前面的谓语be marked by）
整个句子翻译下来是：依赖性的第一个特点是越来越多的容忍,即越来越多的这种想要达到期望的效果所必须的东西；而当这种东西不复存在之时,将显示出不理想的退步的征状——这是依赖性的第二个特点.
衷心希望帮到你!