降价有几种说法：
1 on sale
2 sell at a reduced price
3 at a discount
这些衣服正在降价销售,可以说：
These clothes are on sale.
这些衣服前几天在降价销售
These clothes were on sale several days ago.
或者These clothes were sell at a reduced price.
如果有具体折扣,就用discount~