What do you mean by endless human joys and sorrows?

The joys and sorrows of the world, the joys and sorrows of life. According to the relevant information of the songs of sorrow and joy in the world, the meaning of the songs of sorrow and joy in the world refers to the joys and sorrows of life. It reflects a person's perception of life and inner self-cognition. Life is never static, it changes every day.