So let me just define that.

我就这样规定了。

哈佛公开课 - 计算机科学课程节选

If you were to say to me, what do you think is the most important thing, however you define thing, that has changed the character of life in the United States in the twentieth century, I would say the disappearance of farmers.

如果你问我,我认为什么才是,最重要的东西,你认为是什么,在二十世纪改变了,美国人的生活方式,我会说是农民退出了历史舞台

耶鲁公开课 - 古希腊历史简介课程节选

It's not enough to say these are the components of the vector; you've got to tell me, "I am working with i and j, which I define in the following manner."

所以,只说"这些是某矢量的分量"是不够的,你还得告诉我,"我选取的基矢是 i 和 j,它们是这样定义的"

耶鲁公开课 - 基础物理课程节选