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.
我们以优惠价格出售毛衣。
希望以优惠价格入住酒店的顾客数量还在不断地增加。
The number of shoppers looking for a bargain will continue to rise.
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