电力市场中，发电商要面对燃料市场和电量市场的双重价格风险，必须寻求有效手段进行风险管理。
In electricity market, as facing double price risks of fuel market and electricity consumption market, generators must seek effective means to manage risks.
在我写那本书的时候，中国还实行着双重价格制，在机票、火车票、旅游景点门票等方面，外国人要比中国人付的多得多。
At the time I published my book, there was still a dual pricing system whereby foreigners paid much more than Chinese for airline and train tickets, entry to tourist sites, and the like.
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