In many parts of the world renewable energy is already a principal energy source.

在世界许多地方，可再生能源已经是一种主要的能源来源。

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All right folks, let's continue our discussion of alternative energy sources and move on to what's probably the most well-known alternative energy source—solar energy.

好了，朋友们，让我们继续讨论替代能源，来说说可能是最著名的替代能源——太阳能。

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The sun basically provides Earth with virtually unlimited source of energy everyday, but the problem has always been how do we tap this source of energy.

基本上，太阳每天为地球提供几乎无限的能源，但问题一直是我们该如何利用这能源。

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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

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

Meanwhile, whatever happens with nuclear energy, solar power remains the most dynamic, fastest-growing source of clean, renewable energy and, indeed, of any energy source.

FORBES: Solar Power: Ready, Set, Grow

As a result, companies and governments need to find a way to bridge the current fossil fuels era to the next era, where clean energy will become a key energy source.

FORBES: Every Company Is An Energy Company

The EcoHub app works by pulling overall home energy usage data, provided by an energy data source, such as a utility or smart meter company.

ENGADGET: Chevy Volt EcoHub app tells drivers how little they pay to charge, goads them into staying green (video)