名词
中文翻译：信号
同义词：
['sign', 'indicator', 'indication', 'token', 'mark']
例句：
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1. The policeofficer gave the driver a stern look as he approached the traffic signal.
警察向司机投去严厉的目光，当他接近交通信号灯时。
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2. He noticed the change in the weather and felt a sudden urge to call his sister, who was in another city.
他注意到天气的变化，突然感到想要给在另一个城市里的姐姐打电话。
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3. The new policy is designed to signal the government's commitment to environmental sustainability.
新政策旨在显示政府对环境可持续性的承诺。