This building is surrounded by firewalls.

The fire department works around the clock to prevent fires.

He believes that resorting to violence is never acceptable.

He emphasized the importance of national defense.

His rule turned into tyranny.

He took a big risk to start a new business.

We need to strengthen our defensive preparations against military threats.

We installed a new security system to fortify our home.

We are engaged in trade between Japan and China.

His facial appearance reflects his character.