voucher

n. /ˈvaʊtʃər/ B2

凭券；代金券

A printed piece of paper that can be used to pay for goods.

仙境例句

The March Hare gave Alice a voucher for one free story from the Dormouse.

三月兔送给爱丽丝一张兑换券，凭它可以听睡鼠免费讲一个故事。