电动汽车成本？
电动汽车是节能的，这也使它们的运营成本更低。
Electric vehicles are energy efficient, also making them cheaper to operate.
有人认为，一旦将发电成本综合考虑在内，在能源使用方面，电动汽车的效率只能达到目前现代柴油车的一半。
Some say that once the costs of power generation are factored into the equations, electric cars are only half as efficient with regard to energy use as modern diesel vehicles.
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