裂变
fission
核~nuclear fission/军用~物质fissible material for military purposes/自发~ spontaneous fission/ ~材料 fissile materials; fissioner /~产物fission product /~弹fission bomb/~核物质fissionable nuclear material/~武器fission type of weapons/~物质fissionable materials;fissible material/~式原子弹fission bomb