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2. Mathematical period: For a function f (x), if there is a non-zero constant T, so that when x takes every value in the domain, there is f (x + T) = f (x), then the function f (x) is called a periodic function. The nonzero constant T is called the period of this function.Ordinary exercises, also known as "naive exercises", are basically just doing something over and over again, and expect to improve performance and level only by that kind of repetition.“狮子座”男主林辰（王森 饰）和“双鱼座”女主陆心语（李斯丹妮 饰）在咖啡屋相遇相知，作为咖啡大咖在展示拉花技能时也不忘将个人感情传递其中，暗送秋波，一对性格鲜明的星座CP造就了咖啡屋年轻人之间的喜怒哀乐。作为每次事故的“煽风点火”者，“处女座”林帅（李昶 饰）和“双子座”周诗瑶（林清 饰）从冤家路窄到相知相杀，拌嘴、使坏、互撕又到和好，满满的戏剧冲突奏响咖啡屋的每一次笑声，谱写出一曲当下都市青年群体的情感乐章。六位年轻人联手打造出一部大师级“撩情”手册，网络谈情说爱范本指日可待！The enemy launched a powerful attack? Counterattack: To attack after evading the enemy's attack. After the successful counterattack, it will become invincible within a certain period of time.一场紧张、刺激、惊险的战斗即将开始，天狼星人能否在地球少年的帮助下打败邪恶外星势力并重返天狼星？“天狼号”的超级能源成长后会有什么样炫酷的变化？就这样，【翠花】和【天下第一高手】开始一段激荡人心、荡气回肠的江湖之旅。Fire emergency