在这里by只是个辅助,其实没有多少意思.减少的数量是减少－（decrease）后面的4units,by 在这里的意思跟你老师说的减少的数量无关,但为了让句子更加通顺就要在句子里加by.减少了－decreased by,主要的意思还在decreased里面而已.
英语句子The year 1993 decreased by 4 units.中的by是到的意思是达到了还是减少了4的意
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