1. witness: vt. ①be present at (sth.) and see it 当场见到/ 目击 ②suggest, indicate 表明/ 说明

vi. give evidence about sth. in a law court 作证 witness to

Did anyone witness the accident?

We were witnessing the most important scientific development of the century.

His loud voice witnessed his anger.

Her flushed ( 通红) face witnessed the great excitement she felt.

He witnessed to having seen the man enter the building.