Discoveries are a regular occurrence here. A few kilometers outside Harar, a guide leads visitors up a mountainside to a cave chiseled by the Harla people who lived here for centuries.

VOA: standard.2009.12.14

So we now have a real usable criterion to help guide our understanding of whether things happen by themselves of their own accord or not.

所以我们找到了一个非常有用的判据,这个判据能够指导我们,弄明白变化是否,是自发发生的。

麻省理工公开课 - 热力学与动力学课程节选

The food guide pyramid was the government's effort, put through by the U.S. Department of Agriculture about what people should eat optimally.

食物金字塔是政府努力的结果,它是由美国农业部提出的,关于人们最佳饮食结构的建议

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Well, this is the original food guide pyramid, it's supplemented by a more recent version and I'll show you in just a second.

这是一个最初版本的食物金字塔,最近有一个新版本对其进行了补充,我马上会给大家展示

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选