Coupon
01
优惠券, 代金券
a small piece of document that is used for buying things with a lower price
例子
He forgot to bring the coupon to the supermarket.
他忘了把优惠券带到超市。
She used a coupon to get 20 % off her purchase.
她使用了一张优惠券来获得20%的购买折扣。
02
样品, 优惠券
a test sample of some substance
