Nuclear fusion is the source of energy in stars such as the sun

核聚变是恒星提供能量的源泉，就像太阳一样

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The sun is the major source of energy for our planet.

太阳是我们星球能量的主要来源。

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Humanity has been trying to use the sun's light as a reliable source of energy for centuries.

几个世纪以来，人类一直试图利用太阳的光作为可靠的能源。

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They have a material that supplies electrons and a power source that lifts the energy level of those electrons.

VOA: special.2010.09.01

Glucose has to get into cells, that's the main source of energy source that cells use, metabolism of glucose.

但葡萄糖又必须进入细胞,因为它是细胞能量的主要来源,即通过葡萄糖代谢产生能量

耶鲁公开课 - 生物医学工程探索课程节选

The plant is a major source of food energy and a major food security crop.

VOA: special.2010.06.08

These are obstacles inherent in the source of the energy that will be difficult to surmount.

WSJ: The Experts: What Renewable Energy Source Has the Most Promise?

Knies is hopeful that soon the world will embrace solar power as the leading source of energy.

CNN: Biography: Gerhard Knies

Jim Yong Kim, speaking at Davos, said the institution should not "turn its back" on poor nations that seek the cheap source of energy.

BBC: Jim Yong Kim