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1·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。

2·In a recent speech in Iowa, he dismissed wind power as an unreliable energy source.

最近在爱荷华州的一次演讲中，他将风力发电视为一种不可靠的能源。

3·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。

4·Which Green Energy Source Is the Best?

哪一种绿色能源才是最好的？

5·The second-most-hazardous energy source?

而第二危险源是什么呢？

6·They are increasingly being used as an energy source.

海洋覆盖了大部分地球，它是提供食物和其他产品的重要源头，海洋日益成为重要的能源仓库。

7·The problem is that fat is an inefficient energy source.

但问题是脂肪是个抵消的能量源。

8·It could prove to be an energy source in the future.

也许将来它会变成一种能源。

9·Artificial Leaf Turns Sunlight Into a Cheap Energy source.

“人工叶片”：将阳光转化为廉价能源。

10·Extroverted Personality Traits: Energy Source of extroverts.

外向人群性格特征：能量的源泉。