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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

2. • 釋義

   n.

   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
3. • 更多解釋

   perpetual motion

   • IPA[pəˈpɛtʃʊəl ˈməʊʃn]

   英式

   • n.
     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

   Oxford Dictionary