yī​bǎ​yào​shi​kāi​yī​bǎ​suǒ

customization

一把钥匙开一把锁 (一把鑰匙開一把鎖) yī​bǎ​yào​shi​kāi​yī​bǎ​suǒ
customization
The idiomatic concept that different situations, problems, or individuals require unique, tailored solutions.
mechanical specificity
The literal physical principle that a specific key is required to open a specific lock.

Frequency

Written text
0.054 per million

Sources

Definitions
CC-CEDICT
Frequency data
BCC Corpus (BLCU)