Today we have advice about growing another root vegetable,carrots.

VOA: special.2009.02.24

And the fourth thing to notice is, I've used abstraction. I've said nothing about how I'm going to make square root.

第四件事情就是，我运用了抽象,我对怎么去求平方根没有提及。

麻省理工公开课 - 计算机科学及编程导论课程节选

About 80% of the cyanide at that point is gone, so it does render the root much more safe.

这时大约百分之八十的氰化物都跑掉了，因此这确实可以使这些根更加安全。

麻省理工公开课 - 化学原理课程节选

We've talked about the root of the triad.

我们讨论了三和弦的根音。

耶鲁公开课 - 聆听音乐课程节选

The institutions and the ideas therefore, that provide for freedom and improvement in the material conditions of life, cannot take root and flourish without an understanding of how they came about and what challenges they have had to surmount.

故此,这些机制和理念,为物质生活条件的自由和改善,提供了基础,但在不知道其根源且,无法预料的挑战之前,机制和理念是不可能扎根的

耶鲁公开课 - 古希腊历史简介课程节选

And the good news was we didn't have to worry about how math did square root or anything like that, we just got it and we used it.

也可能是其他数，好消息是,我们不必担心math函数是怎样开方的,我们只要使用它就好。

麻省理工公开课 - 计算机科学及编程导论课程节选