名词
中文翻译：秘密信号
同义词：
['secret communication', 'covert communication', 'clandestine communication']
例句：
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1. The secret signalling between the twocountries has been a point of contentionfor years.
两国之间的秘密通信多年来一直是争议的焦点。
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2. The government's covert communication with the opposition party was keptunder wraps until the election.
政府与反对派政党的秘密沟通在选举前一直保密。
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3. The clandestine communication between thetwo leaders was crucial to their successful negotiations.
两位领导人之间的秘密沟通对他们成功的谈判至关重要。