这是最基础的挑战：我们经常给予只会吸收少量热能的目标大量的热能，并且这样的目标一旦多吸收一点就会被毁掉。

That's the basic challenge: We're often aiming a fire hose of heat at targets that can only absorb a slow trickle, and that will be ruined if they absorb a drop too much.

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相对来说核事故的危险性要小的多，但是一旦发生，就是非常严重的事故。

The risks of a nuclear accident are small in comparison. But when one of them happens, it does so big time.

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刚开始时您可能不这样认为，因为您需要学习如此多的新工具，但是一旦您拥有了一个适当的XML解决方案，那么您的站点管理琐事将显著减少。

You might not think so when you get started, since you need to learn so many new tools, but once you have an XML solution in place your site management chores will be dramatically reduced.

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So, one we finish our discussion of how we think about multi-electron atoms, we can go right on and start talking about these other things.

一旦我们结束了,多电子原子的讨论,我们马上就可以,开始讨论这些问题。

麻省理工公开课 - 化学原理课程节选

What you'll actually find in terms of asking your TAs about the Lewis structure rules is that sometimes they won't be as good at them as you are, and the reason is once you've drawn enough of these structures, you start to get a lot of chemical intuition about it just looks wrong to you if it's wrong.

其实如果大家去问助教,路易斯结构的规则是什么的话,你会发现他们有时候可能并不比你们记得更清楚，因为一旦你画过足够多的路易斯结构，你就会开始获得很多化学直觉,如果它是错的，那么对你来说它看起来就是错的。

麻省理工公开课 - 化学原理课程节选

So, you're having a good year this year maybe-- it looks that way now-- and you think you can't afford it, but just think how bad it will be if it's a bad year.

也许对你来说,今年年景不错,起码现在看起来是这样的,你只是觉得买不起保险,那么一旦歉收,你的处境会有多糟呢

耶鲁公开课 - 金融市场课程节选