劍橋詞典used to describe an agreement between a business and customer in which the customer's money will be returned if they are not satisfied with the product or service (不滿(mǎn)意)可退款的 a money-back deal /offer /guarantee 不滿(mǎn)意可退款的交易/推銷(xiāo)/擔(dān)保 返回 money-back