名词
中文翻译：永久磁铁
同义词：
['permanent electromagnet', 'permanentmagnetic material']
例句：
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1. Thepermanent magnet is used to attract iron filings.
永久磁铁用于吸引铁屑。
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2. Thepermanent magnet has a strong magnetic field.
永久磁铁具有强大的磁场。
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3. The permanent magnet wasused in the invention of the electric motor.
永久磁铁被用于电动机的发明。