名词
中文翻译：Unknown
同义词：
['earth current meter', 'geomagnetic current meter', 'geomagnetic current meter']
例句：
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1. The earth-current meter is used to measure the magnetic field strength in the Earth's core.
地电流计用于测量地球核心的磁场强度。
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2. The earth-current meter was invented by a scientist who wanted to study the Earth's magnetic field.
地电流计是由一位科学家发明的，他想研究地球的磁场。
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3.The earth-current meter can detect changes in the Earth's magnetic field caused by natural phenomena.
地电流计可以检测地球磁场因自然现象而发生变化。