redeem a coupon的用法和樣例：
例句
- Would Fang please accept the gift coupon as a token of his congratulations on their marriage.
禮券一張，是結婚的賀儀，尚乞哂納。 - The face value of the cash coupon awarded is calculated based on the accumulated portfolio subscription amount during the Promotion Period.
獲贈現金禮券的面值將基於客戶在整個推廣期內的累積認購額計算。
