He is working hard on his studies every day.

I use plain flour to make bread.

Thanks to his serendipity, we were able to find a new business opportunity.

Intermolecular forces are an important factor in determining the properties of a substance.

Katoriki is a rare name, isn't it?

General relativity is a theory of physics proposed by Einstein.

Special relativity is one of the fundamental theories of physics.

He went to America as an international student.

My older brother is attending a college in Tokyo.

He is a professor of algebra.