All right, so I did this not at all purposely, but this can point out for you that you need to make sure that the number of electrons that you have in your molecular orbital does match up with the total number that you have in your atomic orbitals.

我并不是故意这么做的，但这告诉我们必须要保证,分子轨道里的电子数,和原子轨道里的,总电子数能对上。

麻省理工公开课 - 化学原理课程节选

I thought I still have to work for another 30, 40 years. I need to do something else.

我原本想，我还必须工作三四十年。但我需要做点别的事情。

怡人的的汉普斯特德 - SpeakingMax英语口语达人

But in order to do so, you have to use terms like "punishment" and "reward" and "reinforcement" in such a vague way that in the end you're not saying anything scientific.

但如果你要这样去做，你就必须将惩罚，奖励“,强化之类的术语概念模糊化,最终你所作出的解释便毫无科学性。

耶鲁公开课 - 心理学导论课程节选

We have many billionaires in this country and I think that the only thing you have to do with it is philanthropy. They have to give it away because they are essentially satiated.

我们国家有很多亿万富翁,但对于有钱人,有一点必须做的就是,他们必须给予别人物质上的帮助,是因为他们已经够丰衣足食的了

耶鲁公开课 - 金融市场课程节选

Now, in that Northern society and here we're using labels pretty loosely, but so be it the northern states; and well I'll leave the outline up for the moment. No I won't.

现在,在北方社会,现在我们标记做得很散,但必须这样,北方的州,我呆会会给你们一个大纲,但不是现在

耶鲁公开课 - 美国内战与重建课程节选

But what you have to do is you have to force yourself to forget that.

但你必须做的就是强迫自己忘记这点。

生存英语 - SpeakingMax英语口语达人

We make software; we make technology; we're innovative ,but so are they So, what we really have to do is become a lot more productive and we have to make our companies a lot more competitive. Today, I feel we're losing that edge.

我们生产软件；发展工业技术;,我们有创新能力，但他们也有,所以，我们现在必须要做的就是提高生产效率,我们必须提高我国公司的竞争力,现在，我觉得在这方面我们正在丧失竞争优势。

耶鲁公开课 - 金融市场课程节选