如果这个理论是正确的，那么吸入含有额外二氧化碳的空气应该会引起打哈欠，而吸入纯氧应该可以抑制打哈欠。

If the theory was correct, breathing air with extra carbon dioxide should have triggered yawning, while breathing pure oxygen should have suppressed yawning.

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如果这个理论成立，意味着这种细菌能够适应从缺氧到含氧的海洋环境。

If that is the case, the species was able to adapt from anoxic, or oxygen depleted, environments to an era of oxygenated oceans.

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大家细想一下：如果这个理论错了，也许就没有我们这些在座的芸芸众生啦！

But consider this: if the theory weren't right, it's possible that none of us would be here to contemplate anything at all.

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And if you're not prepared to believe it, it looks as though you've got to give up on the personality view.

如果你无法接受这个观点，那看来你得放弃人格理论的观点了。

耶鲁公开课 - 死亡课程节选

And my purpose will be not to say something as a postulate, but to show you where everything comes from, and it's best for you if you try to follow the logic.

我的目的不是,简单地告诉你们一个假说,而是给你们讲清楚这个理论的来龙去脉,如果你们能理解推导过程那就再好不过

耶鲁公开课 - 基础物理课程节选

If this theory you might say of sort of cataclysmic change is true we cannot rule out the possibility that a constitution like ours or even identical to ours existed at some point in the ancient past in the far distant past that Aristotle knew about.

你们可能认为，如果这个理论,即剧烈变革的理论为真,我们就不能排除,像美国宪法,或相同于美国之其它现存宪法,早在远古。

耶鲁公开课 - 政治哲学导论课程节选