名词
中文翻译：信号镜
同义词：
['beacon mirror', 'signaling device', 'signaling mirror']
例句：
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1. The police officer used a signaling mirror to warn the driver of his approach.
警察用一个信号镜来警告司机他的到来。
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2. The engineer installed a signaling mirror on the bridge to improve traffic flow.
工程师在桥上安装了信号镜，以改善交通流量。
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3. The pilot used a signaling mirror to communicate with the ground control tower.
飞行员使用信号镜与地面控制塔进行通信。