We need to know that energy consumption represents the single largest controllable operating expense for a building, typically a third of variable expenses.
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。
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According to statistics, travel expense has been the second biggest controllable cost, which is next to human resource, in enterprise operation.