He used that information to threaten me.

Mr. Tada is a novelist.

Nuclear fission is a powerful process that generates energy.

He is an expert in molecular biology.

She uses a diaeresis in her name.

Octans is one of the constellations in the southern hemisphere.

I went to the market accompanied by my mother.

My son participates in judo practice every day.

This is an important problem.

Deuterium is one of the isotopes of hydrogen.