This castle is characterized by its nightingale floor, which is designed to prevent enemy intrusion.

This castle has existed for centuries.

We installed fire alarms to defend our house against fire.

The characteristic of this building is its unique design.

The security system detected a penetration.

The enemy's army invaded our country.

He does stretching every morning to relieve the stiffness in his body.

I heard the beautiful song of the Japanese bush warbler in the park.

Mr. Uguisu is my neighbor.

He made various efforts to solve the problem.