This castle has existed for centuries.

We installed fire alarms to defend our house against fire.

The dry moat of this castle was very deep, playing a role in preventing enemy invasions.

He worked hard to accomplish his goals.

The security system detected a penetration.

The enemy's army invaded our country.

His role is the team leader.

I was amazed at his extraordinary talent.

Please press this button in case of emergency.

It is a very beautiful view.