名词
中文翻译：永久磁铁效应
同义词：
['permanent magnetic effect', 'permanent magnetism']
例句：
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1. The permanent magnetism of the Earth's core is responsible for its rotation.
地球核心的永久磁铁效应是其自转的原因。
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2. The permanent magnetism in a piece of iron can be used to attract or repel objects.
铁块中的永久磁铁效应可以用来吸引或排斥物体。
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3.Permanent magnetism has applications in many fields, including electronics and navigation systems.
永久磁铁效应在许多领域都有应用，如电子和导航系统。