yī​gè​luó​bo​yī​gè​kēng

staffing

一个萝卜一个坑 (一個蘿蔔一個坑) yī​gè​luó​bo​yī​gè​kēng
staffing
each person has their own specific position or job with no redundancy; one-to-one allocation of personnel to tasks
suitability
each person or thing has its own specific place or partner; a proper match for every situation

Frequency

Written text
0.100 per million

Sources

Definitions
CC-CEDICT
Frequency data
BCC Corpus (BLCU)