煤炭和天然气主要用于发电，而石油主要用于给运输提供能量，但所有这些能源的价格是相互关联的。

Coal and natural gas are mainly used for electricity generation, whereas oil is used mostly to power transportation, yet the prices of all these energy sources are linked.

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她每天吃脱水食品、能量棒或这两样掺合着吃，这些食物每天给她提供5000卡路里的热量。

She'll eat 5000 calories of dehydrated food, energy bars and trail mix daily.

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研究表明，糖类给大脑提供的能量可以帮助大脑在冲动的时候维持自身控制，也就是说，糖类可以帮助人们在受到压力的时候控制住自己。

The energy boost provided by the sugar enables the brain to maintain control over its impulses, meaning people can prevent themselves from reacting spontaneously when under stress, researchers said.

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Imagine how much power it takes to drive an artificial heart, so you've got to have a battery or some way of generating power continuously to operate that and that makes it difficult to think about implantable and so that's a really good example of Biomedical Engineering.

驱动人工心脏所需要的能量是难以想像的,所以需要电池或者是某种持续发电装置,来给人工心脏提供能量,这就增加了人工心脏的植入难度,这是很好的生物医学工程的例子

耶鲁公开课 - 生物医学工程探索课程节选