天安 てんなん沈没 ちんぼつ事件 じけんでしょう
ten nanchimbotsujikendeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 天安沈没事件

1. Probably the Tiananmen Square incident.

Polite
Presumptive
Conjecture