The ship entered the port flying a quarantine flag.

The police are looking for an eyewitness to the incident.

The seismologist is studying earthquake prediction and disaster prevention.

He was an eyewitness to the incident.

The freight train passed through the station.

Let's roll the dice and decide the next action.

He is a world-famous physicist.

She is wearing ethnic clothes.

The doctor examined his semen sample.

My blood type is A.