大俊、小美、倪培文是三个玩得很好的小伙伴，他们的妈妈都在上海打工。从来没有坐过火车的倪培文兴高采烈的通知大家，说自己要到上海找妈妈。由于没有及时买到票，他的行程被推迟了。几个孩子继续一起玩耍，彼此的友谊分分合合，在燥热的天气里，人们慵懒的生活着，树上的蝉儿鸣叫不停，最终倪培文坐上了去上海的车。 　　Dajun, Xiaomei, and Ni Peiwen are three good friends, their mothers all work in Shanghai. Ni Peiwen, who has never taken a train before, happily informed everyone that he was going to Shanghai to spend the summer vacation with his mother. As the ticket was not bought in time, his trip was delayed. The children continued to play together, their friendship was sometimes close and sometimes distant.In the hot weather, people lived lazily, and the cicadas on the tree screamed non-stop, and finally Ni Peiwen got in the train to Shanghai.