人工 じんこう放射 ほうしゃ せい元素 げんそでしょう
jinkōhōsha sei gensodeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 人工放射性元素

1. Artificial radioactive element probably.; It will likely be an artificial radioactive element.

Polite
Presumptive
Conjecture
Physics