wire-rod concave

例句：

1. 1.The wire-rod concave is a crucial component in the construction of bridges.
   电线杆凹面是桥梁建设中的关键部件。
2. 2. The engineer carefully examined the wire-rod concave to ensure its stability.
   工程师仔细检查了电线杆凹面，以确保其稳定性。
3. 3. The wire-rod concave plays an important role in transmitting electrical signals.
   电线杆凹面在传输电信号中起着重要作用。