In spring, swallows fly back. It stopped gently on a big tree, stood in the warm sunshine and sang happily. Suddenly, she saw a crow, flew over and said to the crow, "crow, crow, I'm flying back!" " Look how ugly your black feathers are! I am much more beautiful than you! The crow said to the swallow, "You won't come back until spring to show everyone your beautiful feathers. When winter comes, you will fly away coldly. Although my feathers are not beautiful, they can make me feel warm in winter instead of cold. "

This means that a healthy body is the most beautiful appearance.