他正在处理公务。
tā zhèngzài chǔlǐ gōngwù 。
He is dealing with official business.
这个会议是关于国家公务的。
zhègè huìyì shì guānyú guójiā gōngwù de 。
This meeting is about national official business.
我因公务不能参加聚会。
wǒ yīn gōngwù bùnéng cānjiā jùhuì 。
I cannot attend the gathering due to official business.