sth be discounted by x%
问题描述：
sth be discounted by x%
比如说,the dress is discounted by 30%,是指打三折,还是打七折?
答
介词by表示,改变的量,翻译成“了”比如：The price has risen by 30 percent.价格上升了百分之30.介词to,表示达到,到达,The price has reduced to 30 percent.价格降低到了原来的30%.the dress is discounted by 30%...