名词
中文翻译：磁线
同义词：
['magnetic field', 'magnetic field line']
例句：
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1. The magnetized iron bar is attracted to the north pole.
被磁化的铁棒被吸引到北极。
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2. The scientist used a compass to find the line of magnetic force.
科学家用指南针找到了磁力线。
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3. The line of magnetic force can be used to determine the direction of Earth's magnetic field.
磁力线可以用来确定地球磁场的方向。