"We need to learn from this episode and act quickly to fix the flaws in our system because our security is at stake and lives are at stake,".

VOA: standard.2009.12.29

But that's a little bit hard, we aren't all that good at seeing electrons with our eyes, so we need to think of a way to do this.

但那有一点困难，我们都不能通过眼睛看到电子，我们需要想一种方法去做到它。

麻省理工公开课 - 化学原理课程节选

A-Yes, so this is what you mean by the parodying shift that we need, A-desperately need in our foreign policy B-Yes.

所以这是您所说的,我们所需要的转变，我们在外交政策方面急需做出的转变。

普林斯顿公开课 - 国际座谈会课程节选

This means we need a total of eight electrons in our molecular orbitals.

这意味着分子轨道里,一共有八个点子。

麻省理工公开课 - 化学原理课程节选

If we need a 7, this is the ones column, the twos, fours, eights, so here are our columns and this was our decimal system a moment ago, and I wanna express the number 7 and the only digits 0 I now have access to are zero and one, whereas, in decimal, dec meaning 10.

如果你需要7，这是一位，二位，四位，八位，这是位数,刚才说的十进制的位数，我想表达7而且,只能采用数字1与，在十进制中，dec意思是十。

哈佛公开课 - 计算机科学课程节选

This is nothing that we need to worry in our food supply.

我们一点都不需要担心食品供应的问题。

麻省理工公开课 - 化学原理课程节选

So, we need to fill our octet for selenium, so 1, 2, 3, 4.So, this is our Lewis structure here, hopefully you can see why it's not linear.

我们要填满硒原子的八配位，所以1，2，3，4。这就是Lewis结构，希望你们能看出来为什么它不是直线型的。

麻省理工公开课 - 化学原理课程节选