Noun:

1. reproduction of some unicellular organisms by division of the cell into two more or less equal parts

2. a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy

breaking up破裂

divisionn.划分；除法；部门；分开；师（军队）

schismn.分歧；分裂；分立；分派（教会）

scissionn.切断；分离；分裂

separationn.分离；分居；缺口；分隔线；[化]离析；【航】间隔

splittingadj.剧烈的动词split的现在分词.

nuclear fission核子分裂； 核裂变

1. Energy is released by the fission of atomic nuclei.
   能量是由原子核分裂释放出来的。
2. When atoms split, the process is called "fission".
   原子分裂时，其过程被称为“裂变”。
3. The fission products formed are highly radioactive.
   所生成的裂变产物具有很强的放射性。