拦河坝

例句：

1. 1. The engineers are working on building a new dam to control the floods.
   工程师们正在建造一座新的大坝以控制洪水。
2. 2. The construction of the dam has been completed successfully.
   大坝的建设已经成功完成。
3. 3. The dam is a marvel of modern engineering.
   大坝是现代工程的杰作。