Yamada's son is a very excellent student.

He understood that it was necessary to obey the prison rules.

My son has become a doctor.

This building is designed to withstand lateral pressure during an earthquake.

When the engine's piston moves, the car moves forward.

He was hospitalized for a blockage in his heart.

It is important to exercise every day and maintain good health.

He is leading a very healthy life.

The first day of the month is the beginning of a new month.

I will hold my birthday party on the fifth day of the month.