passive relay station

例句：

1. 1. The passive relaystation is responsible for monitoring the traffic flow.
   被动式继电器站负责监控交通流量。
2. 2. The passive relay station has been upgraded to improve its efficiency.
   被动式继电器站已经升级，以提高其效率。
3. 3. The passive relay station helps to maintain the stability of the power grid.
   被动式继电器站有助于维护电网的稳定性。