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.
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.
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