The crucial difference between Britain and America is the class system.
英国和美国最重要的区别是社会阶层体系。
Europe still had its old class system.
欧洲仍然存有其古老的阶级制度。
小班制；
The fifth part: the teaching strategies of optional class system in senior high schools.
第五部分：普通高中走班制教学策略初探。
Introduction to class, system safety, and hazard identification (PDF).
课程介绍，系统安全，和危险确认(PDF)。
Introduction to class, system safety, and hazard identification (PDF).
课程介绍，系统安全，和危险确认(PDF)。
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