It's over three years since I began to learn English.此处的over

问题描述:

It's over three years since I began to learn English.此处的over
我觉得不是三年多的意思,而是三年的意思.但是over的作用是什么呢?

over three years 就是"三年多"的意思
over = more than 超过,多于
He is over seventy .他七十多岁了.