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Coupon
01
优惠券
a small piece of document that is used for buying things with a lower price
02
优惠券
a test sample of some substance
例子
They offered a discount on the product against a coupon.
I'm saving coupons to purchase that expensive gadget at a discount.
The coupon was not validly applied, resulting in a dispute over the final purchase amount.
The company offers shareable discounts and coupons to encourage customers to spread the word.
The student managed finances thriftily, using discounts and coupons to save money on purchases.
