sth be discounted by x%

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sth be discounted by x%
比如说,the dress is discounted by 30%,是指打三折,还是打七折?

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%,是打了3折,也就是原来的7折.

sth be discounted by x% be known by sth. be praise by sb for sth be turned off by sb./sth. sb.be bored by/with sth. 英语翻译是不是 be surprised by sth. impress sb with sth; sb be impressed by sth; impress sth on sb,be attracted to sth.与 sb .be attracted by sth.的区别? be turned off by sb./sth.的用法被动语态中by with什么时候用,比如be made by sb be filled with sth 高手英语翻译an idea that was discounted by most when it was first impress sb sth/sb be inpressed by/with sth 怎么分辨?意思各是什么?