extreme floods

• 特大洪水

extreme floods的用法和样例：

例句

1. The damages created by the extra-large floods are exceptionally serious.
   这次特大洪水的破坏非同寻常。
2. This summer, our country faced the test of our severest floods in a century.
   今年夏天，国家发生了百年不遇的特大洪水灾害。