dykes and dams

例句：

1. 1. The dykeis a crucial barrier against flooding.
   堤坝是防止洪水的关键屏障。
2. 2. Theconstruction of the damhas been delayed due to unforeseen engineering issues.
   由于未预见到的工程问题，大坝的建设被推迟了。
3. 3. The dam provides avital source of water for irrigation in the region.
   大坝为该地区的灌溉提供了宝贵的水源。