Birds miss spring because they know that flying is the value of life. Does this passage matter before and after?

This is very important. Because it literally means that the bird is attached to spring, but when you think about it, the bird is not attached to spring, but knows that spring is a good opportunity for it to learn to fly, and it has to study hard to fly. Because spring will pass quickly. Only by learning the excellent skills of flying well can we better protect ourselves and realize the value of life. Therefore, the bird's attachment to spring is related to its understanding that flying is life.