Traditional energy resources, such as coal, oil and natural gas are non-renewable, which means that the world will eventually run out of them, constituting the main threat to energy resources.

例如煤炭、石油和天然气等传统能源是不可再生的，这就意味着世界的这些能源将最终消失，这主要威胁了世界的能源资源。

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Up to now, all theoretical research on natural resources and their exploitation and utilization are based on the basic knowledge of "natural resources are useful natural substance and energy".

迄今为止，所有关于自然资源的理论研究与开发利用都是建立在“自然资源是有用的自然物质和能量”这一基本认知之上的。

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Coal, petroleum and natural gas are unrenewable resources, so it is important to improve energy utilization and save mineral resources.

煤炭、石油、天然气都是不可再生资源，如何提高能源利用率、节约矿产资源显得更加重要。

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While EnCana and four others fell in the rankings, five rose: Penn West Petroleum, Talisman Energy, Suncor Energy, Canadian Natural Resources and Husky Energy.

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Senator Frank Murkowski, who chairs the House committee on Energy and Natural Resources, said the energy secretary made repeatedly given assurances that improved security measures at the lab were protecting America's nuclear secrets.

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"Co-operation between Russia and Asia is already very diverse and includes natural resources such as energy and ore, " says Alexander Abramov at the Far Eastern Centre for Economic Development.

BBC: Davos 2011: Medvedev opens WEF with call to action