He was reassigned to the position of department manager.

Despite his efforts, he failed the exam.

Scientists are advancing research on nuclear fusion.

He looked around in all directions, but there was no one.

It is the power of nature that gives us this beautiful scenery.

He is fifty years old and still full of energy.

My birthday is on the fifteenth.

In chemistry class, I learned about the process of polymerization.

Through this chemical reaction, monomers polymerize to form polymers.

My room is twenty-five square meters.