【结构分析】本句包含由but连接的两个并列分句。前一分句是一个主系表结构，其中主语由what引导的主语从句充当。后一分句中包含which引导的定语从句which such a technology might be drawn修饰先行词science，关系代词which指代science在从句中作be drawn from的宾语，本句表现为from提前，我们可还原从句部分为such a technology might be drawn from (science)。
【参考译文】我们需要的是一种行为技术，但是目前产生这种技术的科学进展缓慢。
【真题例句】It’s theory to which many economists subscribe, but in practice it often leaves
railroads in the position of determining which companies will flourish and which will fail。(2003阅读3)
【结构分析】本句与上句也同，也包含两个并列分句，由but连接，体现转折关系。前一分句的表语theory由关系代词which引导的定语从句to which many economists subscribe修饰。在该定语从句中，which作subscribe to的宾语，本句体现为介词to提前的形式，我们可还原其为many economists subscribe to (the theory)。后一分句中，determining的宾语由两个which引导的名词性从句充当，分别为which companies will flourish 和which will fail。
【参考译文】这种理论是多数经济学家都赞同的，但在实际操作中，它常常使铁路公司获得了决定哪家公司兴盛哪家公司倒闭的权力。
(2)代替先行词与介词构成介宾结构在从句中作状语
【真题例句】They are the possessions of the autonomous (selfgoverning)
man of traditional theory, and they are essential to practices in which a
person is held responsible for this conduct and given credit for his achievements。(2002-64)
【结构分析】本句包含两个并列分句。在and后的并列分句中，practices由一个which引导的定语从句in which a person is held responsible for this conduct and given credit for his achievements修饰。关系代词which在从句中指代practices与in构成介宾结构，翻译为“在个人行为中”作整个从句的状语。
【参考译文】自由和尊严(参见原题)是传统理论中自主人所拥有的，并且是个人行为中必不可少的——人要对自己的这种品行负责并且因其成就被给予奖励。
【真题例句】Television is one of the means by which these feelings
are created and conveyed—and perhaps never before has it served so much so connect
different peoples and nations as the recent events in Europe. (200546)
【结构分析】本句与上句同，也包含and连接的两个并列分句。前一分句中，表语部分means由定语从句by which these feelings are created and conveyed修饰。关系which指代means与介词by相连，翻译为“通过这种方式”，在从句中作状语。后一分句提前了never构成倒装(参见倒装章节)，并使用了so much…as的比较结构(参见比较章节)。
【参考译文】电视是产生和表达这些感受的手段之一——在欧洲近来发生的事件中，它把不同的民族和国家连到一起，其作用之大，前所未有。
4。非限制性定语从句只用which，并多译为并列句结构。
【真题例句】The more foreign capital you have helping you build your Third Wave
infrastructure, which today is an electronic infrastructure, the better off you’re going to be。(2001阅读2)
【结构分析】本句主干是the more…the more…(越来越)结构。关系代词which引导的非限制性定语从句作分隔结构，其中，关系代词which指代先行词infrastructure作从句中的主语。
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