名词
中文翻译：Unknown
同义词：
['signal', 'light', 'beacon', 'indicator']
例句：
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1. The traffic policeman stopped the car at the red traffic signal.
警察在红绿灯处停下了车。
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2. The new traffic signal has improved safety on the busy street.
新的交通信号提高了繁忙街道的安全性。
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3. The beacon on the ship guided the lost sailors back to shore.
船上的灯塔指引了迷失的水手们回到岸边。