成语“周而复始”是指每增加一定的量(或时间)之后所出现的结果相同。数学中的周期性函数用这一成语来诠释,既通俗易懂,又耐人寻味。为什么人们能够根据今天星期几,从而推算出几年、几十年后,甚至几百年后的今天是星期几,这就是同余问题,与每周七天的周期性相关。在学习周期函数和周期性的过程中,因为没有铺垫,学生对 Idioms “round the clock ” means that the same result occurs after every additional amount (or time). The periodic function in mathematics is interpreted in this idiom, which is both easy to understand and intriguing. Why people can figure out today’s day of the week from a few days to a few years, or even a few hundred years later is the day of the week. This is the problem of congruence, which is related to the periodicity of seven days a week. In the learning cycle function and cyclical process, because there is no bedding, students right