Nutrients get broken down into several classes and these are the constituents of food that your body uses for one purpose or another.

营养素这个问题需要花几节课来讨论,它们是食物的组成要素,供给身体吸收,支持身体机能运转

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

What are the ingredients or constituents ? or elements of a good life versus a bad life?

好的人生和坏的人生,各有哪些组成或要素？

耶鲁公开课 - 死亡课程节选