the disposable plastic bags has a lot of elements that （it）diffcult to erosion
问题描述：
the disposable plastic bags has a lot of elements that （it）diffcult to erosion
里面的it需不需要?
答
用不用it都不对,后面的erosion就不是正确的英语表达,正确的说法是
The disposable plastic bag has a lot of elements that are difficult to degrade.这里要说分解,不是风化.