warning signal

The smoke detector emits a loud warning signal when it senses smoke.

烟雾探测器在感应到烟雾时会发出响亮的报警信号。

The warning signal on the dashboard indicated that the engine was overheating.

仪表盘上的警告信号显示发动机过热。

The system sent a warning signal to the operator before the critical failure.

系统在发生严重故障前向操作员发出了报警信号。