かく分裂 ぶんれつ連鎖 れんさ反応 はんのうでしょう
kakubunretsurensahannōdeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 核分裂連鎖反応

1. Probably a nuclear chain reaction.

Polite
Presumptive
Conjecture
Physics