fission

铀原子核的裂变释放出巨大能量。

The ___fission of uranium nuclei releases tremendous amounts of energy.

变形虫通过二分裂繁殖，分裂成为两个相同的子细胞。

Amoebas reproduce through binary ___fission, splitting into two identical daughter cells.

这家初创公司的快速增长导致原团队分裂为三个独立的部门。

The startup's rapid growth led to a ___fission of the original team into three separate divisions.