他山之石可以攻玉 [－－－－－－－－]

Jyutping taa1 saan1 zi1 sek6 ho2 ji5 gung1 juk6
Pinyin tā shān zhī shí kě yǐ gōng yù

Definitions (CC-CEDICT)
  1. lit. the other mountain's stone can polish jade (idiom); to improve oneself by accepting criticism from outside
  2. to borrow talent from abroad to develop the nation effectively