So, it's a force field is the gradient of a potential so, I'll still keep my plus signs.

有一个力场，它是某种势的梯度，我们还是保持正号。

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There is another thing that we know because if a force derives from a potential 0 then that means its curl is zero Thats the criterion we have seen for a vector field to derive from a potential.

我们还知道,如果力是由势产生的,那么其旋度是,这就是我们得到的,关于从势产生的向量场的准则。

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When the magnetic field deviates from potential or force-free field, the field-aligned current can be produced, and it relates closely with the intensity and lifetime of ducts.

当磁场偏离势场或无力场时，将会产生场向电流，该电流与导管的强度和稳定维持密切相关。

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