用户在现实生活中使用优惠券前必须在线购买优惠券。
Users must purchase a coupon online before using it in real life.
Groupon与此类似，因为它在激活前要求一群人购买优惠券。
Groupon is similar in that it requires a bunch of people to buy a coupon before it's activated.
它还要求公用事业公司以优惠价格购买风能，从而保证投资者有一个客户群。
It also mandated that utilities purchase wind energy at a preferential price—thus guaranteeing investors a customer base.
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