all red signal

例句：

1. 1.The all-red signal is a universally recognized indicator of danger.
   全部红色信号是一个普遍认可的危险指示。
2. 2. In the event of an emergency, the all-red signal will be displayed to alert everyone.
   在紧急情况下，将显示全部红色信号以提醒每个人。
3. 3. The all-red signal was followed by a sudden drop in stock prices.
   全部红色信号之后，股票价格突然下跌。