In the spring, the walls and floors of the south sky will be out of water. Due to the cold weather in winter, the walls and floors are cold. If the warm and humid air flows through the walls and the floor, the water in the air will condense into water droplets and attach to the walls and the floor, as if the walls and floors are seeping water. In the summer, even though there is a moist ocean current, the walls and floors are not cold enough, and the walls and floors are still not watery.