優先 ゆうせん取組 とりくみ物質 ぶっしつでしょう
yūsentorikumibusshitsudeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 優先取組物質

1. Probably a priority substance.; Likely a priority material.

Polite
Presumptive
Conjecture