observation of fire

例句：

1. 1. Firefighters areconducting a fire observation of the area.
   消防员正在对该地区进行火灾观察。
2. 2.The scientist conducted a fire observation to studyits behavior.
   科学家进行了一次火灾观察，以研究其行为。
3. 3. During the fire observation, they noticed that the flames werespreading rapidly.
   在火灾观察期间，他们注意到火焰正迅速蔓延。