All of the cameras reviewed below have the standard features - Exposure Control (Bulb, Manual, Shutter-priority, Aperture-priority, Auto, Depth of Field), Shooting Modes (Close-up, Landscape, Sports, Portrait and Night), Metering Modes (Spot, Partial, Evaluative, Center-weighted), shoot in RAW, RAW+JPEG and JPEG, White Balance Control and Exposure Compensation. Most offer an 18-55mm, f/3.5-5.6 kit lens as standard. The evolution of human beings has been through the process of inorganic small molecule, organic small molecule, organic polymer, multi-molecular system, primitive life, low animal, high animal and so on. The value phenomenon is accompanied by the development of human beings, and it is important to understand the origin of value in order to understand the value in a comprehensive and profound way, and to eliminate the many controversies existing in the theoretical circle of value. Humans evolved from lower animals, and the value phenomenon is not born, nor is it produced overnight. It has its own origins and evolves with the evolution of human beings. breakthrough, but said, the final agreement was established to minimize the trade barriers, and to provide enough time to implement change.