pantograph horn

例句：

1. 1. The pantograph horn is essential for the operation of the tram system.
   拉车用的长杆是电车系统运行所必需的。
2. 2. The train was pulled by a pantograph horn that extended from the station to the city center.
   一列火车被从车站延伸至市中心的拉车用的长杆拉动。
3. 3. The engineer had to adjust the pantograph horn to ensure smooth progress through the tunnel.
   工程师必须调整拉车用的长杆以确保火车顺利通过隧道。