knife-edge relay

例句：

1. 1. The engineer used a knife-edge relay to connect the circuits.
   工程师使用刀锋式继电器连接电路。
2. 2. The relay is designed with a knife-edge for quick and efficient operation.
   该继电器设计有刀锋，以实现快速且高效的操作。
3. 3. The relay was tested under extreme conditions to ensure its durability and reliability.
   在极端条件下测试了继电器，以确保其耐用性和可靠性。