advance warning signal

例句：

1. 1.The police issued an advance warning signal towarn the public of the impendingstorm.
   警方发布了一个提前警告信号，警告公众即将到来的暴风雨。
2. 2. The militaryhas been issuing advance warning signalsto prevent potential disasters.
   军队一直在发布提前警告信号，以防止潜在的灾难。
3. 3. Thecompany issued an advance warning signal about apotential safety hazard in their factory.
   该公司发布了一个关于工厂潜在安全隐患的提前警告信号。