我们家对门邻居有个和我儿子年龄相仿的女儿叫欢欢。两家大人没啥交往,俩孩子却交上了朋友,欢欢常到我们家串门,儿子也会去她家玩耍。去年秋天,两个孩子上了不同的小学,每天早出晚归,见面的机会渐渐地就少了。突然有一天,我家门口外出现了一个纸做的小信箱,是用透明胶粘在墙上? My family called my neighbor a daughter of similar age to my son. No relationship between the two adults, the two children have made friends, Huanhuan often come to our house, his son will go to her house to play. Last fall, two children went to different primary schools. Every morning and evening, the opportunities for meeting gradually diminished. Suddenly one day, a paper-made small mailbox appeared outside my house and was glued to the wall with glue.