The traffic accidents in the city decreased by 30% last year.The traffic accidents in the city decreased 30% last year.两句都对么?意思一样么?

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Thetrafficaccidentsinthecitydecreasedby30%lastyear.Thetrafficaccidentsinthecitydecreased30%lastyear.

The traffic accidents in the city decreased by 30% last year.The traffic accidents in the city decreased 30% last year.两句都对么?意思一样么?
The traffic accidents in the city decreased by 30% last year.
The traffic accidents in the city decreased 30% last year.两句都对么?意思一样么?

The traffic accidents in the city decreased by 30% last year.The traffic accidents in the city decreased 30% last year.两句都对么?意思一样么?
第一句是对的,介词by表示“减少了.”不可缺.介词to表示“减少到.”
第二句是错误的.

第一句的意思是:该城市去年交通事故减少了30%。
第二句的表达是错误的
(还有一种表达是:decrease to a%,意思是减少到百分之a)
希望采纳

第一句是对的,介词by表示“减少了......”不可缺。介词to表示“减少到......”
第二句是错误。