名词
中文翻译：地下通信
同义词：
['subterranean communication', 'underground communication', 'subterranean communication']
例句：
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1. They used to communicate with each other through underground tunnels.
他们过去通过地下隧道相互交流。
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2. The underground communication system is crucial for emergency response.
地下通信系统对于紧急响应至关重要。
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3. The underground communication was so secret that only a few people knew about it.
地下通信非常隐秘，只有少数人知道。