automatic telephone trunk network

例句：

1. 1.The automatic telephone trunk network is essential for communication in large cities.
   自动电话交换机网络对于大城市的通信至关重要。
2. 2. The automatic telephone trunk network provides a reliable and efficient way to connect people across the country.
   自动电话交换机网络提供了一个可靠且高效的全国范围内连接人们的方式。
3. 3.With the development of technology, the automatic telephone trunk network has become more advanced and user-friendly.
   随着技术的发展，自动电话交换机网络变得更加先进和用户友好。