So, in fact, it's a vector field.

事实上，是一个向量场。

We have this vector field.

这是向量场。

That was a vector field in the plane.

它是一个在平面上的向量场。

That is my curve and my vector field.

那就是曲线和向量场。

It is proportional to this vector field.

它与向量场成比例。