Whereas the use of synthetic fertilizers has greatly expanded agricultural productivity in many parts of the world,an increase in their use can create ---------------------------------- serious environmental problems such as water pollution, and their ------------------------------------------------------------------ substitution for more traditional fertilizers may accelerate soil structure --------------------------------------------- deterioration and soil erosion. 答案就是画线的部分 我的疑问是 whereas这个疑问词做对比时 不需要像unlike compare to 一样结构完全对比吗?? the use of .... 和 an increase 结构不同不是吗??? --

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