The Bell-Lancaster system was widely used in the 19th century to educate large numbers of students with limited resources.
贝尔兰卡斯特制在19世纪被广泛用于在有限资源下教育大量学生。
In this system, senior students taught younger ones, creating a hierarchical learning environment.
在这种制度下，高年级学生教低年级学生，形成了一个等级化的学习环境。