vouchers

n.

凭证( voucher的名词复数 )；证人；证件；收据

voucher system付款凭单制度

gift voucher 礼券（等于gift token）

cash voucher优惠券；现金凭单

1. Some firms give their workers luncheon vouchers, which they can use to buy meals.
   有些公司发给职工午餐券,用以购买膳食。
2. She has a voucher for a free swim.
   她有一张免费游泳的凭证。

Mobility, Targeting, and Private-School Vouchers
Method for marketing and redeeming vouchers for use in online purchases
ENFORCING AUTHORIZED DOMAINS WITH DOMAIN MEMBERSHIP VOUCHERS
Vouchers for Private Schooling in Colombia: Evidence from a Randomized Natural Experiment. NBER Working Paper Series.
Private School Vouchers and Student Achievement: An Evaluation of the Milwaukee Parental Choice Program
Private School Vouchers and Student Achievement: An Evaluation of the Milwaukee Parental Choice Program
Self-contained payment system with circulating digital vouchers
Competition between Private and Public Schools, Vouchers, and Peer-Group Effects
Replication data for: Vouchers for Private Schooling in Colombia: Evidence from a Randomized Natural Experiment
Public Housing, Housing Vouchers, and Student Achievement: Evidence from Public Housing Demolitions in Chicago