名词中文翻译
中文翻译：警戒信号
同义词：
['warning signal', 'alert signal']
例句：
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1.The guard signal was a flashing red light.
警卫信号是一个闪烁的红色灯光。
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2.He received the guard signal and stepped back.
他收到了警卫信号，后退了一步。
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3.The guard signal prevented the intruder from entering the building.
警卫信号阻止了入侵者进入大楼。