你有没有试过某个怪诞的想法突然不知道从某个地方冒出来，而且你根本不知道为什么你会在这个特定的时候冒出这种特别的想法？

HAVE you ever experienced that eerie feeling of a thought popping into your head as if from nowhere, with no clue as to why you had that particular idea at that particular time?

youdao

我想让你们看到，格林公式是怎么在这个平面中运用的，但是也牵涉到功和旋度等等，这也是比较特别的地方。

Stokes' versus Green. I want to show you how Green's theorem for work that we saw in the plane, but also involved work and curl and so on, is actually a special case of this.

youdao