This sculpture is made of pure copper.

He considered the problem from a humanitarian perspective.

She is interested in tea ceremony, a traditional East Asian art.

I transferred the data to the new computer.

In this chemical reaction, a specific isotope is produced.

This chemical reaction occurs between homogeneous substances.

They are making products using materials of the same nature.

My son is learning karate.

He guided us.

We are actively participating in local activities.