The question is what does the curl of a force field mean?
问题是一个力场的旋度代表什么？
It tells you that you cannot get energy for free out of your force field.
就意味着你不可能在力场里面无偿地得到能量。
There is a force field around the arbitrary magnetic pole.
在任一个磁极的周围有一个力场。
There is a force field around the arbitrary magnetic pole.
在任一个磁极的周围有一个力场。
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