topological cross section

例句：

1. 1.The topological cross section of the tunnel is 30 meters wide.
   隧道的拓扑截面宽度为30米。
2. 2.The engineer calculated the topological cross section of the bridge to ensure its stability.
   工程师计算了桥梁的拓扑截面，以确保其稳定性。
3. 3. The topological cross section of the new design is more efficient than the old one.
   新设计相比旧设计具有更高的拓扑截面效率。