1. 报警信号灯：Warning sign 警告标志 | Warning light 报警信号灯 | Wall recess 壁上隐藏凹进处

2. 警示灯：417 不定分段焊接法 wandering block method | 418 警示灯 warning light | 419 冲洗槽 wash trough

3. 报警灯：warning lamp 警号灯 | warning light 报警灯 | warning mark 报警标志

4. danci.edu.pub

4. 警报灯：warning lamp 警报灯 | warning light 警报灯 | warning signal 警告信号

1. a cautionary sign of danger

    Synonym: red light