[tā shān zhī shí kě yǐ gōng yù, ㄊㄚ ㄕㄢ ㄓ ㄕˊ ㄎㄜˇ ㄧˇ ㄍㄨㄥ ㄩˋ, 他山之石可以攻玉] lit. the other mountain's stone can polish jade (成语 saw); to improve oneself by accepting criticism from outside; to borrow talent from abroad to develop the nation effectively [Add to Longdo]