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

And the point of this is so that you don't come to class heads down the whole time thinking everything I say is absolutely worthy of being written down.

这样做的意义在于你不必,从头到尾去考虑要不要,把我所说的都记录下来。

哈佛公开课 - 计算机科学课程节选