dǐ​céng HSK7

bottom layer

底层 底層 dǐ​céng
bottom layer noun
The lowest floor of a building (ground floor) or the bottom-most level of an object or structure

The restaurant is located on the first floor and serves breakfast only.

underclass noun
The lowest level or rung of society; the disadvantaged or marginalized social classes

I’m at the bottom of society.

low-level
(bound form) The deep structure in linguistics or the underlying base structure of a system

Frequency

Movie subtitles
2.86 per million appears in 1% of films
Written text
6.10 per million

Details

HSK 3.0
Level 7

Sources