But every year,it comes alive for just one purpose.

VOA: standard.2010.03.22

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

I'm sure they sold it in various forms, but one of the most popular was for this purpose.

我确信他们出售各种用途的橄榄油,但最普遍的还是作为清洁工具

耶鲁公开课 - 古希腊历史简介课程节选

But his question is still one that lingers and one that Plato includes for a purpose.

但他的问题仍萦回不散,且柏拉图是因为一个目的来加以收录。

耶鲁公开课 - 政治哲学导论课程节选