Physics is the science that studies the basic forms, properties, motion, transformation, and internal structure of matter in the universe, in order to understand the constituent elements of these structures and the fundamental laws governing their interactions, motion, and transformations. Physicists strive to discover the underlying laws of all physical phenomena, with the aim of achieving a unified understanding of the physical world. While gradual progress has been made in this endeavor, attaining this ultimate goal still remains a distant prospect. It appears that humanity's exploration and investigation of the objective world is an endless pursuit.