flood tuff

例句：

1. 1. The flood tuff in the riverbed is evidence of the recent heavy rainfall.
   河床上的洪水沉积物是最近大雨的证据。
2. 2. The flood tuff has been dated to the 19th century.
   洪水沉积物被确定为19世纪的产物。
3. 3. The archaeologists excavated the flood tuff to uncover ancient civilizations.
   考古学家挖掘洪水沉积物以揭示古代文明。