它获取植物在光合作用过程中产生的能量，光合作用是一个将太阳光转化为植物自身能量的过程。

It captures the energy which plants produce during photosynthesis—a process of converting sunlight into energy.

youdao

如果是这样的话，问题的关键就变为，我们如何避免自身能量水平的降低？

If so, the key question becomes: how can we prevent such drops in our energy level?

youdao

最明显的方式是：植物将光能转化成化学能，或者有些动物吃植物来维持自身能量。

There are the obvious: like turning light into chemical energy like plants do. Or eating plants like many animals do.

youdao

It's very important because it provides-- does provide energy but it helps with muscle building and with the manufacturing the body does of its own proteins, and therefore, is a vital part of the diet.

蛋白质非常重要,因为它能提供,的确能提供能量,但它也能帮助肌肉塑形,参与身体内自身蛋白的合成,因此是饮食中不可或缺的组成部分

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选