和大家特别熟悉的定语从句的关联词相比,as作为关联词引导定语从句的用法显得非常特殊,不为大家所了解。as既可以引导限制性定语从句,也可以引导非限制性定语从句。在第二种用法中,我们要特别注意它和which的区别。 Compared with the related words of the attributive clause that we are all familiar with, the usage of as as the related word to guide the attributive clause is very special and not for everyone to understand. as can guide the restrictive attributive clause, you can also guide the non-restrictive attributive clause. In the second usage, we pay special attention to the difference between it and which.