relay contact

例句：

1. 1. The relay contact was a crucial part of the transmission system.
   接力接触是传输系统的关键部分。
2. 2. During the relay contact, the signal was sent from one station to another.
   在接力接触期间，信号从一个站发送到另一个站。
3. 3.The relay contact was responsible for ensuring the safety of the transmission line.
   接力接触负责确保传输线路的安全。