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顾名思义，定语从句就是充当定语，用修饰名词或代词的句子。被修饰的名词或代词称作先行词，在先行词和定语从句之间通常会有关系代词或关系副词，也即定语从句的引导词.常见的关系代词有that, which, who,whom, whose，关系副词有why, when, where.相比其他引导词引起的从句，由that, which, who和why引导的定语从句在雅思写作中使用的频率较高. 　　由that/which引导的定语从句that和which引导的定语从句的主要的区别在于that引导的定语从句既可以用来修饰人，也可以用来修饰物，而which引导的定语从句则多用来修饰物;which可以用来引导非限定性定语从句，而that则不能。 　　Endangered languages are languages that/which are slowly disappearing because of technology and the desire for cultures to assimilate. 　　濒危语言指的是那些由于科技和文化同化欲求而逐渐消失的语言。 　　Addiction is a brain disease that/which changes a person"s neurochemistry. 　　上瘾是一种改变一个人的神经系统的大脑疾病。 　　Overpopulation and fresh water shortage are two thorny problems that/which people are confronted with today. 　　人口过剩和淡水短缺是当今人们面临的两大棘手问题。 　　Traditional schools offer cultural and sports activities that/which the home一schooled children will miss out on. 　　传统学校提供一些文化和体育活动，这些是在家中接受教育的孩子等将会错失的东西。 　　The people that you met in the campus yesterday are from England. 　　你昨天在校园里碰到的那些人来自英国。 　　以上是由广州启德教育小编为您整理的关于that丨 which引导的定语从句的全部内容。