seive bend

例句：

1. 1. The car had a seive bend in the road.
   汽车在路中间有一个弯管。
2. 2. The engineer designed the new bridge with a seive bend to improve traffic flow.
   工程师设计了一座新桥，带有一个弯管以改善交通流量。
3. 3. The old house had a seive bend that made it difficult to access the attic.
   这座老房子有一个弯管，使得进入阁楼变得困难。