And now you have a tetrahedron with equal length bonds.

四面体型的四根等长的键。

麻省理工公开课 - 固态化学导论课程节选

So people from all the different subways and all the different neighborhoods come to Union Square.

所以四面八方的人们乘各路地铁到这儿来。

在超市购买的画 - SpeakingMax英语口语达人

And so now I have hydrogens at the four corners of a tetrahedron.

放在碳正四面体,的四个角上。

麻省理工公开课 - 固态化学导论课程节选

And this is about... I think in some ways what I describe Princeton as is a privileged but a microcosmo of the world where people are coming together and bumping up against people with whom they very much disagree.

这是关于。,我认为，我觉得普里斯顿大学,是一个特殊的,整个世界的缩小版,人们从四面八方聚集,遇到一些与自己想法,出入很大的人。

普林斯顿公开课 - 人性课程节选

I mean, they're surrounded by water everywhere you look.

我是意思是,那儿四面环水

耶鲁公开课 - 古希腊历史简介课程节选

There's water on all sides, so going to the beach if it's sunny.

公园四面环水，所以天气晴朗时可以去海边。

对政治很感兴趣 - SpeakingMax英语口语达人

So, this forms a tetrahedron, which forms the sp3 hybrid orbitals.

这就形成了一个四面体，它是由sp3杂化轨道形成的。

麻省理工公开课 - 固态化学导论课程节选

And the light will be going in all directions.

而且光亮会洒向四面八方。

麻省理工公开课 - 固态化学导论课程节选