Carbohydrates are your body's main source of energy.

碳水化合物是身体能量的主要来源。

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Carbohydrates are the main source of energy for your muscles.

碳水化合物是肌肉能量的主要来源。

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Grain products provide carbohydrates, your body's main source of energy.

谷类食物可以提供碳水化合物，这是您身体能量的源泉。

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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

It results from the 1.6 billion people that do not have any access to electricity whatsoever, the 2.4 billion that have almost no access to electricity and still burn wood and manure as their main source of energy, and the 3 billion new people that will be born by mid-century who will need electricity.

FORBES: What Is Our Energy Future?

The assembly government also drew the committee's fire with its TAN 8 policy for focusing on windfarms as a main source of alternative energy.

BBC: wind turbines generic

One of these sugar molecules is glucose, the main energy source for your body.

CNN: Hypoglycemia