observed radio beacon

例句：

1. 1. The observatory is located in the center of the city.
   天文台位于市中心。
2. 2. The radio beacon station was used to guide ships during the dark of the moon.
   无线电信号灯在满月之夜用于引导船只。
3. 3. The observatory has a large telescope that can observe stars from far away.
   天文台有一个大型望远镜，可以从远处观察星星。