rebate and discount

单词rebate指“退款”,日常生活中,我们常用它来形容“回扣”,如：interest rebate（利息回扣）.在此,请区别rebate（回扣,退款）和discount（折扣,打折）的区别,看例句：
A rebate is distinguished from a discount in that the former is not taken out or deducted in advance but is handed back after payment of the full amount.（退款不同于折扣,退款不是先行扣除,而是在钱全数付清后退还.）