放射 ほうしゃ せん生物 せいぶつ がくではありませんでした
hōshasenseibutsugakudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 放射線生物学

1. Was not radiobiology.; Was not radiation biology.

Past/Perfective
Negative
Polite
Formal Register