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This individual refers to the fourth level, and I will talk about it later.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.胡钧笑对林聪道：如何？阿水其实很能干的，黎指挥老是护着他，他就少了历练的机会，跟我以前一样。等他再刨出那泥中埋着的东西，他就更加确信了。最让秦国士卒赶到无比屈辱的是，几个楚国的士兵解开腰带朝着篝火之上撤尿。天下之术，不止于文，富贵之途，不仅于仕。开朗热情的新任教师沉灵，自踏入校园后就遇见了一连串的死亡意外… 而看似品学兼优，才貌兼具的优秀学生，却有著令人发指的邪恶性格。在长久积弊之下，终于发生令人匪夷所思的连续杀人事件─这些受害的师生们唯一的共同点，皆是在收到通讯软体的特定贴图后，竟离奇的照著贴图的形式死亡… 而层层追查下去，发现命案都与一年前的意外事件有关。最终，随着沉灵继续的调查，将会发现这个案子背后，还隐藏著一个残酷的真相，一个令人无法承受的沉重代价…