名词
中文翻译：Unknown
同义词：
['induction signal', 'induction mark', 'induction symbol']
例句：
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1. The induction sign is used to indicate the direction of a magnetic field.
感应符号用于指示磁场的方向。
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2. The induction sign is crucial for understanding the behavior of electric currents.
感应符号对于理解电流的行为至关重要。
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3. The induction sign is often used in engineering and electrical systems to prevent accidents.
感应符号在工程和电气系统中常被使用，以防止事故。