ひかり触媒 しょくばい作用 さようでしょう
hikarishokubaisayōdeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 光触媒作用

1. Probably photocatalytic action.; Likely to be photocatalysis.

Polite
Presumptive
Conjecture