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3. Physical period: Uniform circular motion is a kind of periodic motion. The so-called periodicity refers to the fact that after a certain period of time, the moving object repeats back to its original position, and the instantaneous speed repeats back to its original size and direction. The time it takes for an object to move in a uniform circle is called a period. The period is expressed by the symbol T, and the period is also a physical quantity describing the speed of uniform circular motion. The long period indicates the slow motion of the object, while the short period indicates the fast motion of the object.不仅如此，这个世界中甚至还有华夏官方组建，用来维护国家秩序、对抗他国修炼者的龙组。In the system, the client often needs to interact with multiple subsystems, which causes the client to change with the change of subsystems. At this time, the appearance mode can be used to decouple the client from each subsystem. Appearance mode refers to providing a consistent facade for a group of interfaces in the subsystem. It provides a high-level interface that makes the subsystem easier to use. For example, the customer specialist of Telecom can let the customer specialist complete the services such as charging telephone charges and modifying packages without interacting with various subsystems by himself. The specific class structure diagram is as follows:　　韩铁匠祖传的青龙刀不幸落入日寇手中,韩铁匠舍身护刀,与宝刀同归于尽。临终留下遗言,希望徒弟们团结一心,共同打出宝刀,报效国家。范增心中重新燃起一丝希望。　　天生之子（郑伊健）自幼居于山中。一日，义救女子林朝英（梁佩玲），朝英却误会为其轻薄，欲杀之泄愤。幸金国世子完颜峰（罗嘉良）相救，两人互相仰慕，义为结拜，峰更代他取名重阳。Arguments is an array of classes made up of incoming arguments. So sidEffect ([a, b, c]) knows that a and c are both 10 and b is 1.