He was repairing the road using a jackhammer.

This rock drill is very efficient and can quickly cut through rock.

There is a new air purifier in my room.

This superheterodyne receiver is very effective in receiving radio signals.

This photocopier is using the latest technology.

Please look at my new camera.

He is an expert in computer science.

The space probe discovered a new planet.

There is still an old ticket machine left at the station.

He used a metal detector to search for treasure on the beach.