以下为句子列表：
英文: Adopting the method of time domain and frequency range, the breakdown characteristic signal is analyzed, and the information of the abnormal state of valve clearance is obtained.
中文: 并采用时域，频域的分析方法对故障特征信号进行分析，从而得到气门间隙异常状态的信息。
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英文: The corrosion current and impressed against-corrosion current of a ship modulated by shaft's rotation will generate an extremely low frequency electric field (ELFE) which becomes a kind of important characteristic signal in sea water.
中文: 摘要舰船的腐蚀和防腐电流经螺旋桨转动的调制后在海水中会産生极低频电场，成爲一种重要的特征信号源。
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