He is a specialist in orthopaedic surgery.

The formation of a mountain requires millions of years.

This medicine is effective for pain suppression.

I decided to take a painkiller because I have a severe headache.

The speed limit on this road is 60 kilometers per hour.

He is my classmate.

The scent of the osmanthus was wafting in the park.

This room is very clean and comfortable.

That oil refinery is refining a large amount of crude oil every day.

My father works at an ironworks.