かく分裂 ぶんれつ物質 ぶっしつじゃなかったです
kakubunretsubusshitsujanakattadesu

Noun
Desu Copula

The polite, past negative form of 核分裂物質

1. Wasn't fissionable material.; Wasn't nuclear material.

Past/Perfective
Negative
Polite
Casual Register
Physics