reduce of,reduce by,reduce to,reduce at分别是什么?都有什么区别?

reduce of,reduce by,reduce to,reduce at分别是什么?都有什么区别? reduce reduce of reduce at呢 reduce by a factor of 3 to 4怎么翻译 有关reduce by的 用法 reduce by和reduce to有什么区别? reduce to和reduce by有啥区别 reduce by 0.5%和reduce 0.5%的区别RT reduce on ,reduce reduce (by) half.Taking out these smoking scenes could reduce the number of teen smokers (by) half.为什么不能用to reduce by 70%应该怎样翻译 reduce level of PM2.5 by 25什么意思?求大神! reduce decrease Reduce是什么意思? 英语单词：reduce reduce是什么意思 reduce 中文 reduce ...to ...,例如：reduce to ,