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讲述发生于2002年到2004年间伦敦警视厅警探科林·萨顿追查到一名连环杀手！调查真实连环杀人案的故事天地不仁，以万物为诌狗。这样的手下，可遇不可求。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.Zhou YuminCloudFlare is a free CDN service and offers a firewall, highly recommended. I would also like to thank @ livid, the webmaster of v2ex.com, for his enthusiastic help. I am using their CDN products now.