他正在处理一些重要的公务。

Tā zhèngzài chǔlǐ yīxiē zhòngyào de gōngwù.

He is dealing with some important official business.

市长每天都要处理各种公务。

Shì zhǎng měi tiān dū yào chǔlǐ gèzhǒng gōngwù.

The mayor has to handle various official matters every day.

他一直致力于公务工作。

Tā yīzhí zhìlì yú gōngwù gōngzuò.

He has been dedicated to official business.