fill dam

例句：

1. 1.The engineers are working on building a new dam to prevent flooding.
   工程师们正在建造一座新的水坝以防止洪水。
2. 2. The dam is holding back the floodwaters from the river.
   大坝正在阻止河水从河流中流出。
3. 3.The dam was built to store water for future use during droughts.
   这座大坝是为了在干旱时期储存水资源而建造的。