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1. Oxford Dictionary

   nuclear fission

   • IPA[ˌnjuːklɪə ˈfɪʃn]

   英式

   • n.
     a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy.

   • noun: nuclear fission

2. • 更多解釋

   nuclear fission

   • IPA[ˌno͞oklēər ˈfiSH(ə)n]

   美式

   • n.
     a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another ...

   Oxford American Dictionary