名词
中文翻译：机密调查
同义词：
['confidential request', 'confidential investigation']
例句：
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1. The company conducted a confidential inquiry into the matter.
该公司对此事进行了保密调查。
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2. The police were called to conduct a confidential inquiry into the crime scene.
警方被召来对犯罪现场进行保密调查。
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3. The government is conducting a confidential inquiry into the cause of the accident.
政府正在对事故原因进行保密调查。