a few hours earlier和a few hours ago的区别

题目

a few hours earlier和a few hours ago的区别
在新概念第二册的Lesson7里,有这么一段话,A few hours earlier,someone had told the police that thieves would try to steal the diamonds中A few hours earlier为什么不能用a few hours ago替换呢?这俩个短语有什么区别,分别用在什么情况下,最好能多举几个例子.

答案

Too Late a few hours earlier,时间段和earlier 一起使用,是以过去或将来某一个时间点为准的一段时间以前 在本文中的意思可以扩展成下列句子 a few hours earlier than the thime when the detectives were waiting ...