barrel culvert

例句：

1. 1. The barrel culvert was designed to divert floodwaters from the river.
   这个桶形涵洞的设计是为了将河水从河流中引流。
2. 2.The construction of the barrel culvert has been delayed due to weather conditions.
   由于天气条件，桶形涵洞的建设被推迟了。
3. 3. The barrel culvert is essential for maintaining water quality in the river.
   桶形涵洞对于保持河流水质至关重要。