Zero vector can have a lot of direction, but only one length.
零向量可以有很多方向，却只有一个长度。
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。
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。
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。
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