The diagonal elements of this matrix are all 1.

Cold fusion is a part of physics and is a phenomenon that is not yet fully understood.

Research on cold fusion is still controversial.

The result is certainly the result of his efforts.

My mother woke me up.

It's difficult to calculate the area of this hexagon.

He is known as an expert in subcritical nuclear experiments.

The Cultural Revolution is a part of China's history.

He claims to have seen an unidentified flying object.

We are providing educational support to developing countries.