因此，对油田企业的环境成本问题进行研究就显得颇有意义。
So study on environmental cost of oilfield enterprises is helpful to the environment.
一些人认为解决环境问题的最好方法之一是增加汽车和其他交通工具的燃料成本。
Some people think that one of the best ways to solve environmental problems is to increase the cost of fuels for cars and other vehicles.
一个复杂的混合成本，技术以及环境问题意味着没有一种能源是最好的。
A complicated mix of costs, technology and environmental issues means no one source is best.
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