Liners differ from other big ships in having a large superstructure.邮船与其他大轮船的区别在于它有庞大的上层建筑。According to Marxist theory, a society's superstructure is its legal, social, cultural and political institutions, which are based on its economic systems.根据马克思主义理论，一个社会的上层建筑包括其法律、社会、文化和政治制度，而这些都是建立在其经济基础之上的。