"I am sure.This,I'm sure, is what we should be doing in the future: paying for the environmental services we get from our environment and paying the people who take care of these services.

VOA: standard.2010.02.24

So again, we should be able to check all of our formal charges and make sure they add up to 0, which they do, and that makes sense, because we have a neutral atom in terms of thionyl chloride.

因此同样地，我们可以检验一下,我们所有的形式电荷是否正确,确保它们加起来等于零，而它们确实是这样，这是合理的，因为亚硫酰氯是一个中性原子。

麻省理工公开课 - 化学原理课程节选

I'm not quite sure where, on balance, we should say how these things play out.

我不是很肯定，总的来说，这些事情是怎么进行的。

耶鲁公开课 - 死亡课程节选