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1. Oxford Dictionary

   atomic clock

   英式

   • n.
     an extremely accurate type of clock which is regulated by the vibrations of an atomic or molecular system such as caesium or ammonia.

   • noun: atomic clock, plural noun: atomic clocks

2. • 更多解釋

   atomic clock

   • IPA[əˈtämik kläk]

   美式

   • n.
     an extremely accurate type of clock which is regulated by the vibrations of an atomic or ...

   Oxford American Dictionary