We've been looking at Plato's arguments for the immortality of the soul, and so far, I have to say I haven't found them very compelling arguments.

我们研究了柏拉图关于,灵魂不朽的论证，到目前为止，我要说的是,我发现这些论证并不是很有说服力。

耶鲁公开课 - 死亡课程节选

So what actually turns out the reality is that h e 2 does exist, but it exists as the weakest chemical bond known, and it wasn't, in fact, even found to exist until 1993, so I can assure you this is not a bond that you see very often in nature, and it is a very, very weak bond.

实际上He2键是存在的，但它是目前所知的最弱的键，直到1993年它才被发现，所以我可以向你们保证在,自然界你们不可能经常看到它，它是种非常非常弱得键。

麻省理工公开课 - 化学原理课程节选