名词短语
中文翻译：汽笛信号旗
同义词：
['whistle signal', 'whistle flag例句：1. The police officer waved the whistle signal to alert the driver to slow down.（警察挥动汽笛信号来警告司机减速。）']
例句：
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1. The police officer waved the whistle signal to alert the driver to slow down.
警察挥动汽笛信号来警告司机减速。
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2. The pilot used a whistle signal to communicate with the ground crew.
飞行员使用汽笛信号与地面控制室进行通信。
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3. The military sent out a whistle signal to warn of an imminent attack.
军方发出汽笛信号以警告即将到来的攻击。