probable maximum flood

例句：

1. 1. The city is facing a probablemaximum flood due to heavy rains.
   由于大雨，这个城市正面临着可能的最大洪水。
2. 2. The government has been working on aplan to prevent possible maximum floods.
   政府一直在努力制定一个计划来防止可能的最大洪水。
3. 3. The flood warning system is designedto detect and alert people of the probablemaximum flood.
   洪水预警系统旨在检测并警告人们可能的最大洪水。