以下为句子列表：
英文: In other words, when the same field source is observed in a different frame of reference, electric field or magnetic field will possess a different nature; whereas when the frame of reference changes, they may change into each other.
中文: 即同一场源在不同的参考系中观测，所得的电场或磁场具有不同的性质；而当参考系变换时它们可以相互转化。
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