Well, if I take the vector field that was in the problem set, and if I do things, say that I look at the unit circle.

如果找一个这个问题中的向量场，然后我们要做的是，假设这个单位圆。

youdao

Remember that was the vector field that looked like a rotation at the unit speed.

我们记得，这是个以单位速度旋转的向量场。

youdao

Remember that was the vector field that looked like a rotation at the unit speed.

我们记得，这是个以单位速度旋转的向量场。

youdao