名词
中文翻译：Unknown
同义词：
['1. light pulse', '2.light beam', '3. light wave']
例句：
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1. The police used a light signal to guide the driver through the intersection.
警方使用一个光信号来引导司机穿过交叉路口。
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2. The engineer sent out a light signal to alert the workers of an emergency.
工程师发出一个光信号来警告工人有紧急情况。
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3. The pilot used a light signal to communicate with the ground crew before landing.
飞行员在降落前使用光信号与地面机组人员进行通信。