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

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 是不是a is decreased by b 是b减a A decreased by b 就是a sat a is decreased by b 是 a-b还是b-a啊 A is decreased by b 是a减b 为什么? increase by 19%是“增加了”还是“增加到19%”? 按月计算工资英语的表达方式是by month还是by the month 为什么 The traffic accidents in the city decreased by 30% last year 想问您by year 和by the year 的区别 by the year 2100什么意思?前面的by啥意思? end有几种词语搭配?如by the end of是到……末的意思 go by是时间流逝的意思.如果说“两个礼拜过去了”Tow weeks?go by还是goes by The costs were_______(减少）by 30% last year .(写出单词的正确形式）