He is immersed in the study of geometrical optics.

He talked about the news with somewhat excitement.

The sympathetic nervous system controls the body's stress response.

She was diagnosed with collagenosis.

The safe harbor rule is a law that protects companies from lawsuits by disclosing certain information.

His story was completely nonsense.

My younger brother goes to and leaves school by bicycle every day.

Monotremata is a part of mammals, and it has different characteristics from other animals such as birds and reptiles.

He works at a major public company.

His grandfather was a member of the special attack squad.