修好 しゅうこう通商 つうしょう航海 こうかい条約 じょうやくだろう
shūkōtsūshōkōkaijōyakudarō

Noun
Da Copula

Expresses probability ("probably…") of 修好通商航海条約

1. Probably a treaty of amity, commerce, and navigation.

Presumptive
Conjecture