The saying that swallows don't go through the bitter cold gate is naturally without scientific basis. For a swallow, it only considers whether it is convenient or not, whether the environment is suitable for him to have offspring, and whether there are tools suitable for nesting nearby. For the family he stayed with, the swallow didn't care whether the family was rich or poor. For example, we can often see swallows nesting in rural areas and other places, but it is almost rare in cities, because swallows are needed. A quiet environment, and can ensure that their nests are not disturbed by people, so the countryside is relatively more suitable for the choice of swallows, and for people, it is natural that people in the city are richer, but swallows don't care at all. The reason why there is this saying among the people is that in ancient times, wealthy people in ancient times liked to build their doorways with spacious and always bright styles, and usually they were paired with high eaves, so for swallows, this high eaves is a good place for them to nest. In ancient poor families, it is very likely that their houses don't even have eaves, which is naturally not suitable for swallows to nest, so they will spread such a statement to comfort their psychology.
Now, most swallows nest in rural areas and other areas. When swallows enter the nest, they don't care who is poor or rich, and more often they appear on the mud walls in rural areas, rather than in the magnificent villas built in the village, which is enough to prove that swallows don't want to find a rich house. For most people, they also have a complex feeling for swallows, which is more from their love. Most people are very happy about the fact that swallows build nests in their own homes, and even they are willing to leave a gap in the window for swallows to enter and leave. Swallows are also a symbol of good luck and happiness in people's hearts, so most people are very happy. Swallows nest in their own homes.