以关系代词as引导的定语从句在科技英语中颇为常见。其中一种句型是被修饰名词前有the same或such,为限制性定语从句。as在定语从句中可用作主语、宾语和表语。其中谓语动词常省略。例如: Pasteur was,In fact,using the same prin-ciple as had been used nearly a century The attributive clause that is led by the relation pronoun is quite common in scientific English. One of the patterns is the same as or before the modified noun, which is a restrictive attributive clause. as can be used as subject, object, and table in attributive clauses. Which predicate verb often omitted. For example: Pasteur was, In fact, using the same prin-ciple as had been used nearly a century