明察暗訪

míngcháànfǎng

observe publicly and investigate privately—conduct a thorough investigation

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ming2 cha2 an4 fang3

open enquiries and secret search (idiom); to investigate openly and in secret, taking information from all sides

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明察暗訪|明察暗访 [míng chá àn fǎng] ► open enquiries and secret search (idiom); to investigate openly and in secret ► taking information from all sides