It also mandated that utilities purchase wind energy at a preferential price—thus guaranteeing investors a customer base.

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。

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You can get a preferential price.

您能得到优惠价。

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A preferential price and good after-sales service, the co-development of the market.

以优惠的价格和良好的售后服务，共同开拓市场。

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The Shanghai municipal government set new price guidelines on homes that qualify for preferential transaction tax treatment, widening a tax benefit for many home buyers in the city as developers struggle with falling sales there.

WSJ: China Construction Starts Slowed in 2011