In a village school in the countryside near Nanjing in the 1920s, one class might have students ranging in age from six or seven to 17 or 18, and the teacher would have to design separate curricula to meet each of their needs.
以二十年代南京鄉間的私塾為例，當時一班學生從六、七歲到十七、八歲都有，塾師對每個學生個別授課。