1. 封建制：feudal institution 封建设施 | feudal system 封建制 | feudalism 封建主义

2. 封建体系：facility n.容易, 简易, 灵巧, 熟练, 便利, 敏捷, 设备, 工具 | Feudal System 封建体系 | geographical adj.地理学的, 地理的

noun

1. the social system that developed in Europe in the 8th century
    vassals were protected by lords who they had to serve in war

    Synonym: feudalism