名词
中文翻译：秘密通信
同义词：
['covert communication', 'clandestine communication']
例句：
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1. The government has been secretly communicating with the opposition party.
政府一直在秘密与反对派沟通。
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2. They conducted a covert communication to avoid detection.
他们进行了一次秘密联络以避免被察觉。
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3. The two countries have maintained clandestine communication through various channels.
两国通过各种渠道保持秘密联络。