名词
中文翻译：应答器
同义词：
['transponder', 'transponder signal', 'transponder beacon']
例句：
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1. The transponder beacon is used to communicate with other ships in the area.
应答器用于与该区域的其他船只进行通信。
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2. The transponder beacon was designed to detect underwater objects.
应答器被设计用来探测水下物体。
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3. The transponder beacon was used to warn of an approaching ship.
应答器被用来警告即将到来的船只。