The gate agent was looking for people to voluntarily give up their seats for a later flight in exchange for a $100 travel voucher.

机场工作人员倡议是否有旅客自愿接受晚一点的航班，作为交换他们将得到价值100美金的旅行优惠卷。

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Another is "tokenisation": the devices do not exchange card numbers, but tokens (a sort of digital voucher), making fraud much more difficult.

另一个是动态安全码技术。 即，设备之间只需交换动态安全码而非银行卡号码，这种做法也使得诈骗难上加难。

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Please visit the immediate members of our company in exchange for the cumulative value of the rebate Voucher.

敬请诸位会员即时光临本茶行公司换取累积超值的回扣礼券。

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Like the rest of Groupon, Getaways will promote limited-time deals requiring customers to make an upfront payment in exchange for a voucher that can then be redeemed within a certain period of time.

FORBES: Groupon Gives Expedia A Positive Jolt With 'Getaways'