1. magnetic north; the needle of a magnetic compass points to the magnetic north pole. 
   磁北；罗盘上的指针指向北方。
2. Do you know who invent magnetic needle? 
   你知道指南针是谁发明的吗？
3. an imaginary line paralleling the equator where a magnetic needle has no dip. 
   地磁赤道连结地球表面上所有磁针呈水平方向平衡并没有倾角的点的线。
4. Deflection of a compass needle caused by local magnetic influence, especially on a ship. 
   罗盘偏差指南针由于局部磁场的影响发生偏移，尤指在船上
5. (physics) the angle that a magnetic needle makes with the plane of the horizon. 
   （物理）磁针与地平线平面所形成的角。

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