日清 にっしん通商 つうしょう航海 こうかい条約 じょうやくでしょう
nisshintsūshōkōkaijōyakudeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 日清通商航海条約

1. Probably the Japan-Britain Treaty of Commerce and Navigation.

Polite
Presumptive
Conjecture