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

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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?

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

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.

七折...把by 换成to 就是三折了...