The level of crime in an area is almost always in proportion to the number of umployer.这句话的主干是主系表结构吗

题目

The level of crime in an area is almost always in proportion to the number of umployer.这句话的主干是主系表结构吗?of crime,in an area都是介词短语做定语吗?这句话的表语是什么?

答案

of crime是,但是in an area是做地点状语
通常我们都把be inproportion to 作为一个固定结构来记,表示“相对于某事物来说”或“与某事物成比例”.这句话可以翻译成：一个地区的犯罪水平几乎总是与失业人数成比例的.