In this experiment, the sample is heated for a certain period of time.

This dish has cooled down, so please heat it up again.

This chemical reaction is very dangerous.

This project aims to promote the local economy.

This project aims to promote the advancement of science and technology.

Your cooperation is needed for this project.

I need you.

This chemical reaction is very dangerous.

This chemical reacts when heat is added.

He is majoring in chemistry at university.