放射 ほうしゃ のう標識 ひょうしきでしょう
hōshanōhyōshikideshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 放射能標識

1. Probably radiolabeled.; Likely radioactive labeling.

Polite
Presumptive
Conjecture