This area is facing a major environmental problem due to mining damage caused by long-term mining activities.

He is conducting research on mining.

He has been working as a doctor in this town for many years.

I haven't seen him for a long time.

He has been working as a doctor in this town for many years.

He is facing a difficulty.

We have to face this problem.

He owns a big house.

In my area, a summer festival is held every year.

We must strive to protect the environment of the Earth.