What's a function, what's a derivative, what's a second derivative, how to take derivatives of elementary functions, how to do elementary integrals.

什么是函数,什么是导数,什么是二阶导数,如何对初等函数求导,如何进行初等积分

耶鲁公开课 - 基础物理课程节选

Well, it's a long time ago but it was elementary school, you know, maybe 3rd grade, 4th grade,

那是很久以前的事情了，应该是小学时候吧，那大概是三年级或者四年级，

美国的博物馆教育 - SpeakingMax英语口语达人

So, so far the American landscape is already a work of art, already part of a European memory. Then something else happens: "But gradually the models of those elementary rusticities became stranger and stranger to the eye, the nearer I came to know them.

至此关于美国景色的回忆已经是一件艺术品了，已经包含一部分欧洲记忆，之后发生了一些事：,然而渐渐地，我越熟悉那些田园风光的基本模式,越看它们越觉得陌生。

耶鲁公开课 - 1945年后的美国小说课程节选

because in elementary school and junior high, you have such a variety of skill levels and effort levels.

因为在小学和初中，大家的水平和努力程度不同。

怎么协调意见冲突 - SpeakingMax英语口语达人

If you experience a lot of stress in high school and elementary school and were unhappy, generally the best predictor would say that you would feel the same way a month into your Harvard experience.

如果你在高中,初中时经历过很大压力而且不快乐，一般来说最好的预言家会说,在哈佛呆上一个月，你会有同样的感觉。

哈佛公开课 - 幸福课课程节选