一把鑰匙開一把鎖 [－－钥－开－－锁]

Jyutping jat1 baa2 joek6 si4 hoi1 jat1 baa2 so2
Pinyin yī bǎ yào shi kāi yī bǎ suǒ

Definitions (CC-CEDICT)
  1. One key opens one lock.
  2. There is a different solution for each problem. (idiom)