He is known as an expert in subcritical nuclear experiments.

A diagonal matrix is a matrix in which all elements outside the main diagonal are zero.

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.

Please calculate the area of this right-angled triangle.

Who wrote the screenplay for this movie?

I want to go to Saint Vincent and the Grenadines.

Ei is good at reciting poetry.

He is studying English.