介词用法
问题描述：
介词用法
1/ efficient models on both earing and growth
这个earing and growth都是修饰model的 用on对么
答
作为一个词组来用,人们更多会说 efficient models of both earnings and growth
但是用在句子里,on both earnings and growth 就有可能不是修饰 efficient models 的后置定语,而是介词短语作状语使用：
We have tried different efficient models on/for both earnings and growth.