fission

n. /ˈfɪʃ.ən/ C2

裂变；分裂

The splitting of an atom's nucleus or a biological cell into parts.

仙境例句

Under the glass, the class watched fission: one tiny animal split neatly into two.

全班在放大镜下观察分裂生殖：一个小小的动物整整齐齐地分成了两个。