(每日一词）hierarchy

Hierarchy  /ˈhaɪ.rɑːr.ki/ n. 等级制度

meaning: a system in which people or things are arranged according to their importance 

1) 词根：hier-神圣的

2) 词根：arch-管理

3) 后缀：-y 名词后缀

e.g. Some monkeys have a very complex social hierarchy. 有些猴群中出现了非常复杂的种族等级。