That was a vector field in the plane.

它是一个在平面上的向量场。

youdao

We had a curve in the plane and we had a vector field.

平面上有一曲线，且存在着向量场。

youdao

We had a curve in the plane and we had a vector field.

平面上有一曲线，且存在着向量场。

youdao