It's obviously not good for the clothes line to run north and south. We all know that the main purpose of drying clothes is to let the sun shine on the clothes and let the water in the clothes evaporate as soon as possible. In this case, the clothesline should be punched in the east-west direction so that the clothes can get more sunshine. On the other hand, if the clothesline is tied in the north-south direction, the clothes will block each other's sunshine and the clothes will not dry easily. Everyone with life experience has this kind of experience.