階層 meaning in English

class [classes]▼(social grouping, based on job, wealth, etc.)
noun
[UK: klɑːs] [US: ˈklæs]

food chain [food chains]▼(idiomatic: a hierarchy)
noun
[UK: fuːd tʃeɪn] [US: ˈfuːd ˈtʃeɪn]

hierarchy [hierarchy]▼(body of authoritative officials organised by rank)
noun
[UK: ˈhaɪə.rɑːk.i] [US: ˈhaɪə.ˌrɑːrk.i]

walk of life▼(occupation, role, class, or lifestyle)
noun
[UK: wɔːk əv laɪf] [US: ˈwɑːk əv ˈlaɪf]

social class [social classes]▼(class of people)
noun
[UK: ˈsəʊʃ.l̩ klɑːs] [US: ˈsoʊʃ.l̩ ˈklæs]