这意味着磁北极的变化与南极磁场发生。

This means that the magnetic North Pole changes place with the magnetic South Pole.

磁北极与磁北极互相排斥.

North magnetic poles repel ( each other ).

磁北极就是另一回事了。

Magnetic north is something else.

正常地它指向磁北极.

Normally it points toward magnetic north.