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Profit is divided into pretax profit and after-tax profit according to its forming process. Profit before tax is also called total profit; Pre-tax profit minus income tax, i.e., profit after tax, also known as net profit Sport is the inherent nature and existence of matter. It is the fundamental attribute inherent in matter, and there is no matter of movement or movement of matter. The conservation of sports is that motion can neither be created nor destroyed, but its specific form is diverse and interchangable, and the total amount of motion in the transformation is constant.