fissionedv.分裂adj.分裂的fissionn.分裂；裂变；【生】裂殖fission mate-rial裂变材料fission track dating裂变轨迹年代测定fission product sail核裂变产物帆fission design style分体式fission gamma energy伴随裂变的γ辐射能量fission nuclear fuel[化] 裂变核燃料fission type reactor核裂变反应堆fission track method裂变轨迹年代测定法fission contribution裂变作用fissionable material裂变物质