Coal is main energy source of the country.

煤炭是我国主要能源。

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Thus would man try to cut the machines off form the sun - their main energy source.

人类企图以此来将机器人与太阳隔绝，因为太阳是机器人最主要的能量来源。

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The principal metabolic pathway of RBC is glycolysis, and the main energy source in most species is glucose.

红细胞的主要代谢途径是糖酵解，而大多数物种的主要能量来源是葡萄糖。

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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

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

CNN: Hypoglycemia

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