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单词 perpetual motion
释义 [U] movement (eg of an imagined machine) that would continue for ever without getting power from an outside source 永动(不需外加能量永久运转, 如假想的机器).
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英汉词典包含54938条英汉翻译词条,涵盖了常用英语单词及词组短语的翻译及用法,是英语学习的必备工具。

 

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