We should think deeply about the reform of the social security system.

He saved money as a safety net before starting his own business.

The safety of this car is very high.

My button came off, so I'm holding it with a safety pin.

Please always fasten your seatbelt when you get in the car.

This area is monitored 24 hours a day by security cameras.

He chose to discard a safe tile in mahjong.

His thought is very unique.

He has an illustrated reference book of insects.

The government is building a nationwide surveillance network.