warning instrument

• 警报器

warning instrument的用法和样例：

例句

1. Advancements were also made in German radar warning receivers.
   德国人对雷达警报器也进行了改进。
2. They had a working smoke alarm which gave them early warning of the fire.
   他们装有防火警报器，它可以向他们提供火灾预警。