序曲在阔别中国二十年后,齐振飞即将离开美国,回到北京。他已经向他任教的匹兹堡市碧波大学请了一年的长假,将去北京的京师大学教书工作一年。自从他十六岁离开北京后,二十年间,他只有在暑假期间回过中国。他没有完整地经历过北京的春夏秋冬、北京四季的交替,没有在北京度过中国的节日,没有在中国工作过。他怀念儿时的北京:柳絮飘扬的春天,凉爽舒服的秋日,瑞雪纷飞的隆冬。他要在北京生活一年,对家乡有一个全面 Overture in the absence of China two decades later, Qi Zhenfei is about to leave the United States, returned to Beijing. He has taught him Pittsburgh City Bibo University for a year long vacation, will go to Beijing for a year teaching at Beijing University. Since he left Beijing at the age of sixteen, he returned to China only during the summer vacation in two decades. He did not fully experience the spring, summer, autumn and winter in Beijing, the alternation of the four seasons in Beijing, the absence of a festival in China in Beijing, and his lack of work in China. He remembers the childhood of Beijing: catkins flying spring, cool and comfortable autumn, snow swirling winter. He wants to live in Beijing for one year and has a comprehensive hometown