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我们应当认识到，能源消耗是建筑物的唯一一项最大的但可控制的营运费用，一般为可变费用的三分之一。
We need to know that energy consumption represents the single largest controllable operating expense for a building, typically a third of variable expenses.
本文研究了无容量限制的带固定费用和可变费用的单物资和二物资的最小费用流问题，并分别给出了多项式算法。
We study uncapacitated version of the minimum cost flow problem of one-commodity and two-commodity with not only fixed cost but also variable cost, and give them each a polynomial algorithm.
很多票价仅对客票上载明的特定日期的航班有效，并且不得变更，或者是在支付相应的费用后方可变更。
Many fares are valid only for the flights on the dates shown on the ticket and may not be changed at all, or only upon payment of an additional fee.
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