名词
中文翻译：信号灯头
同义词：
['signal head', 'light head']
例句：
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1.The traffic policeman was directing the traffic with a light signal head.
交通警察用一个信号灯头指挥交通。
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2. The engineer designed the new light signal head to improve efficiency.
工程师设计了新的信号灯头以提高效率。
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3. The construction workers were installing the new light signal heads on the bridge.
建筑工人正在安装新的信号灯头在桥上。