名词
中文翻译：口哨信号
同义词：
['whistle signal', 'whistle signal']
例句：
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1. The police officer blew thewhistle to alert everyone to stop.
警察吹响口哨来警告大家停下。
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2. Thefirefighters used a whistle signal tocoordinate their efforts.
消防员使用口哨信号来协调他们的工作。
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3. Thegame ended with a whistlesignal, signaling the end ofplay.
比赛以一声口哨结束，标志着比赛的结束。