Dragon suction is a tornado that occasionally appears over warm water. Its upper end is connected with thunderstorm clouds, and its lower end directly reaches the water surface, rotating and moving at the same time. This is a vortex, and the air rotates rapidly around the axis of the tornado. Attracted by the extremely low air pressure in the center of the tornado, the water flow is sucked into the bottom of the vortex and then becomes a vortex around the axis. Tornadoes roll water from lakes or oceans into the air, forming a high water column. Like being sucked into the air, the water in the water column is commonly called "dragon water absorption" or "tornado water". From a distance, the water column swept into the air by a tornado is not only like a python dangling in the air, but also like the nose of an elephant that keeps swinging.