toll telephone circuit

例句：

1. 1.The toll telephone circuit is a crucial part of the communication system.
   电话收费电路是通信系统的重要组成部分。
2. 2. The toll telephone circuit is responsible for transmitting and receiving signals between different networks.
   电话收费电路负责在不同网络之间传输和接收信号。
3. 3. The toll telephone circuit is used to charge users for using the phone service.
   电话收费电路用于向使用电话服务的用户收取费用。