And I said to my advisor, "No, no. I have taken chemistry in high school, and I can assure you that chemistry has no relevance whatsoever to the life sciences."

于是我就去和我导师说：,“我在高中学过化学，我向你保证化学和生命科学,没有任何关联“

麻省理工公开课 - 化学原理课程节选

Well I grew up in Michigan and I can assure you that Michiganders love all those things too and probably even more.

我在密西根州长大,所以我敢保证密西根人也很喜欢这些东西,甚至比南方人更喜欢

耶鲁公开课 - 美国内战与重建课程节选

And so it's not like that, I assure you, it truly isn't.

所以不是那样的,我保证,绝对不是

耶鲁公开课 - 1871年后的法国课程节选

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