So, if you prefer, that's where the gradient vector is zero.

认为梯度向量为零也是可以的。

youdao

OK, so let's assume that we have a vector field whose curl is zero.

假设有一个旋度为零的向量场。

youdao

OK, so let's assume that we have a vector field whose curl is zero.

假设有一个旋度为零的向量场。

youdao