contact wire pre-sag

例句：

1. 1. The contact wire pre-sag was a significant factor in the electrical system's performance.
   接触线预弯曲是电气系统性能的一个关键因素。
2. 2.During the installation process, it is important to pay attention to the contact wire pre-sag to ensure the integrity of the wiring.
   在安装过程中，要注意接触线预弯曲，以确保电线的完整性。
3. 3. The engineer carefully measured and adjusted the contact wire pre-sag to meet the specifications.
   工程师仔细测量并调整接触线预弯曲，以满足规格要求。