如果我们把班级里的人和班级里能提供的新鲜空气、饮用水、卫生条件等资源看成是班级小生态环境的有机整体的话,通常条件下班级所能提供的资源总量和同学们耗费资源数量之间必然有限制和被限制的关系。要保障我们师生的身心健康,保持班级小生态环境的平衡,使资源的人均占有量处 If we look at the resources provided by people and classes in the class as fresh air, drinking water, and sanitary conditions as the organic whole of the class’s small ecological environment, the total resources available to the class and students’ expenses will usually be spent under the conditions. There must be a limited and limited relationship between the number of resources. We must protect the physical and mental health of our teachers and students, maintain the balance of the class’s small ecological environment, and ensure the per capita possession of resources.