| 单词 | covert operation |
| 释义 | covert operation Detectives bugged the family home but gained no evidence from the covert operation, the trial was told. Times, Sunday Times Police then carried out a fivemonth covert operation before swooping. The Sun Other interested parties, including senior jockeys and trainers, have been closely involved in this almost covert operation. Times, Sunday Times Clearly there has been a slow covert operation to make sure the information they were acting on was 100 per cent accurate. The Sun A covert operation to rig the contest and a counter-operation to expose it. Times, Sunday Times |
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