求分析下句 还有 of which 可以用that 替换么 为什么The main purpose of which is to increase the amount but not the quality of foods grown in use of chemicals and fertilizers
问题描述：
求分析下句 还有 of which 可以用that 替换么 为什么
The main purpose of which is to increase the amount but not the quality of foods grown in use of chemicals and fertilizers
答