Wind power is a very clean source of energy.

风能是一种非常清洁的能源。

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Wind power is a very popular source of energy.

风力是一种非常受欢迎的能源。

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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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If properly managed, clearing and replanting trees in a 30-year cycle creates both a renewable source of energy and maximum rubber production.

VOA: standard.2009.09.13

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

Because muscle can use and frequently is using glucose as a source of energy.

因为肌肉细胞可以利用糖分,通常将糖作为能量来源

耶鲁公开课 - 生物医学工程探索课程节选

We've got to invest in a sustained, all-of-the-above strategy that develops every available source of energy.

WHITEHOUSE: President Obama Speaks on Expanding Our Energy Portfolio

What was once considered noise pollution could soon become a green source of energy.

FORBES: Written by Bryan Nelson

The automatic gearboxes so popular in America are an important source of energy losses.

ECONOMIST: Fuel economy