Electricity is one of the most important energy sources, and the quality of electricity is nearly correlative with our lives.

电能是最重要的能源之一，而电能质量与国民经济的各个部门以及人民的生活密切相关。

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Coal is one of the most important energy sources in the world.

煤是世界上最重要的能源之一。

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Canada is a net exporter of oil and natural gas, one of the most important sources of U. s. energy imports.

加拿大是一个石油天然气净出口国，是美国最重要的能源进口国之一。

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"For a country like Saudi Arabia ... one of the most important sources of energy to look at and to develop is solar energy, " al-Nuaimi told the French oil newsletter Petrostrategies.

FORBES: Magazine Article

But the most important thing we can do is to also develop new sources of clean energy and drastically ramp up our energy efficiency.

WHITEHOUSE: President Obama Holds Town Hall in New Orleans