We want to understand how limb design determines the energy costs of walking and running.
我们想了解肢体结构是如何决定步行和奔跑时的能量消耗。
Energy companies welcomed the switch, which will reduce their running costs by making meter readers obsolete and eliminating the customer service time spent on dealing with estimated bills.
能源公司欢迎转用智能表，因为智能表无需抄表员，也无需顾客花费时间处理估算账单，从而能够削减他们的运营成本。
Almost by definition, renewable energy sources have low running costs but high up-front costs.
很明显，可再生能源的运营成本很低，但是前期投入很高。
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