continuous line of shafting

例句：

1. 1.The continuous line of the river runs through the city center.
   这条河流的连续轴线穿过市中心。
2. 2. The engineer designed a continuous line of tunnels for the project.
   工程师为该项目设计了一条连续的隧道线。
3. 3.The continuous line of the railway is visible from the observation deck.
   从观景台上可以看到铁路的连续线路。