uranium 235
uranium-235的词性：
n.（名词）
1. The uranium isotope with mass number 235 and half-life 7.13 × 108 years, fissionable with slow neutrons and capable in a critical mass of sustaining a chain reaction that can proceed explosively with appropriate mechanical arrangements.
铀235：这种铀的同位素，质量数235，半衰期为7.13×108年，可与慢中子发生裂变，并在临界质量中能维持连锁反应，此种反应能通过适当的机械排列爆炸性地开始