名词
中文翻译：磁场
同义词：
['magnetic field', 'magnetic field line', 'magnetic field strength']
例句：
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1. The magnetized metal strips are used to detect the presence of iron in the soil.
被磁化的金属条用于检测土壤中的铁含量。
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2. The scientist explained the principles behind the formation of magnetic fields.
科学家解释了形成磁场的原理。
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3. The Earth's magnetic field is crucial for navigation and communication.
地球的磁场对于导航和通信至关重要。