Once a fire breaks out, firefighters will rush to the scene with the ancient fire truck "water dragon truck" to put out the fire. The principle of the water dragon is very similar to the water guns that children play today. Set up a large bucket filled with water in the car. A manual water pump is installed outside the vehicle, and firefighters push the water pump to pressurize the water in the bucket so that the water can be sprayed towards the fire source. In order to ensure continuous water supply, special personnel are required to continuously carry water and fill it into wooden barrels. The bucket is connected to a water pipe called a "water hose". The front end of the water pipe is usually a water spray head, which is often shaped like a dragon's head and is called a "faucet". Firefighters use hoses to spray water on the fire. Later, all water pipe switches were called faucets.
