The iron in the ship caused a deviation of the magnetic needle of the compass.
船上的钢铁使指南针的磁针产生了偏差.
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构成计算机系统的机械的磁的电子的电的设备.
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They can track the earths magnetic field as sensitively as a compass needle.
它们对地球磁场也十分敏感,如同使用了指南针.
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The magnetic force caused by the electric current reacts the indicating needle to move.
这种由电流引起的磁力会使仪表指针作出反应而移动.
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