rockfill cofferdam

例句：

1. 1. The engineers were busy constructing the cofferdam to hold back the floodwaters.
   工程师们忙着建造围堰以阻挡洪水。
2. 2. The construction of the cofferdam was a major project that took months to complete.
   围堰的建设是一个需要数月完成的重大工程。
3. 3.The cofferdam was designed to withstand the pressure from the rising river levels.
   围堰的设计是为了承受河水水位上升的压力。