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  1. Oxford American Dictionary

    perpetual motion

    • IPA[pərˈpeCH(əw)əl ˈmōSH(ə)n]

    美式

    • n.
      a state in which movement or action is or appears to be continuous and unceasing；the motion of a hypothetical machine which, once activated, would run forever unless subject to an external force or to wear

    • noun: perpetual motion

    • 釋義

    名詞

    • 1. a state in which movement or action is or appears to be continuous and unceasing the planet is in perpetual motion the perpetual motion of the dance floor
    • ▪ the motion of a hypothetical machine which, once activated, would run forever unless subject to an external force or to wear the age-old quest for the secret of perpetual motion a perpetual motion machine