名词
中文翻译：水下信号同义词
同义词：
['submarine signal', 'underwater communication']
例句：
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1. The submarine was equipped withan underwater signal system to communicate withthe surface.
潜艇配备了一个水下通信系统，用于与水面进行通信。
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2. The underwatersignal was so faint that it could notbe heard by the divers.
水下信号非常微弱，以至于潜水员无法听到。
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3. The underwater signal was used to transmit important informationfrom one location to another.
水下信号被用来从一个地点传输重要的信息到另一个地点。