1. a uranium isotope with mass number 235; capable of sustaining chain reactions. 
   铀的同位素，原子质量数为，能进行持续的连锁反应。
2. The isotope of uranium with mass number235, fissionable with slow neutrons. 
   锕铀铀的同位素，原子质量数为235，与慢中子发生裂变
3. the commonest isotope of uranium; it is not fissionable but when irradiated with neutrons it produces fissionable plutonium 239. 
   铀最常见的同位素，不能裂变，但与中子一起被照射后会产生可裂变的钚。
4. a highly fissionable isotope of plutonium that is used in atomic weapons and as a reactor fuel; produced by irradiating uranium 238 with slow electrons. 
   钚的一种极易裂变的同位素，用于核武器或作反应堆燃料，用慢电子辐照铀获得。
5. a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium. 
   一种软质的银色金属元素，稀土属，没有稳定的同位素，作为铀的裂变产物以放射性状态被发现。

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