observe publicly and investigate privately—conduct a thorough investi gation; investigate openly and secretly
❍ 中央派来的官员经过～，弄清了真相，决定平反。Through open and secret investigations the official sent by the central government clarified the truth and decided to reverse the unjust verdicts.
明察暗访
observing publicly and investigating privately;conducting a thorough investigation
明察暗访mínɡ chá àn fǎnɡ
公开调查，暗地里询问了解。形容从各方面进行调查了解。conduct a thorough investigation, observe publicly and investigate privately