signal fire

例句：

1. 1. The military used signal fires to mark the end of a battle.
   军队使用信号火来标示战斗的结束。
2. 2.The fireworks display was spectacular and drew crowds from all over.
   烟花表演壮观，吸引了来自各地的人群。
3. 3. The firefighters used signal fires to guide their way through the forest.
   消防员们使用信号火来在森林中指引方向。