So, when we think about any type of formal charges, we have to assign these based on a formula here, which is very easy to follow.

那么，不管我们要考虑什么样的形式电荷，我们都必须依靠这个公式，它很容易理解。

麻省理工公开课 - 化学原理课程节选

So once you look at Star Festival then you can think about the questions you have to answer and then question maybe the same thing I ask myself: who am I? While maybe some other questions.

所以当你看“七夕“的时候,你可以考虑你必须要回答的问题,这个问题有可能是我问自己的那个同样的问题：,我是谁？或者其它的问题。

麻省理工公开课 - 媒体、教育、市场课程节选