... unstable equilibrium 不稳定平衡 unstable fission 不稳定裂变 unstable isotope 不稳定同位素 ...
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unstable fission product 不稳定裂变产物
unstable e fission 不稳定裂变
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Nuclear fission can only occur in some types of heavy and unstable nuclei such as in the uranium -235 and plutonium -239.
核裂变只能在某种类型的重核及不稳定核素内发生，如铀- 235及钚- 239。
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Fission comes from the relatively unstable isotope u-235.
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