名词
中文翻译：孤独的信号单位
同义词：
['solitary signal unit', 'solitary signal device']
例句：
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1.The lonely signal unit sent out a distress signal to the rescue team.
孤独的信号单位向救援队发出了求救信号。
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2.The solitary signal unit was responsible for monitoring the security of the area.
孤独的信号单位负责监控该区域的安保。
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3. The solitary signal unit was able to communicate with the other units in the area.
孤独的信号单位能够与该地区的其他单位进行通信。