P88—07：题every year thousands upon thousands of people are injured or killed in car accidents all over the world
问题描述：
P88—07：题every year thousands upon thousands of people are injured or killed in car accidents all over the world
问：
1.thousands upon thousands of是一个固定用法吗?
答
thousands upon thousands of 是固定用法,意思为：成千上万,千千万万,无数.upon 介词,本意为：在...上面,当...时候.此处没有意思,仅起连接作用.