Consumer group this week investigated the five biggest voucher sites, and found that many discount codes are out of date or didn't work at all.

消费者权益保护机构本周调查了五大证件激增的网站，并且发现许多折扣码已经过时或者早已失效。

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And this is significant because a voucher program puts the power into the hands of the consumer of the service.

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