What does Yangzhou Swallow mean?

From the folk tradition, swallows entering the house means good luck. From a scientific point of view, swallows will choose a place with good air circulation and light, and no sound vegetation and water. If your home is picked by swallows, it means that your surrounding environment is very good. Generally speaking, the swallow is a lucky bird, and no one dares to hurt him. Every year when they fly back, someone specially nails a long bamboo branch on the wall for swallows to build a house for them (birds)