pole socket

例句：

1. 1.The electrical engineer used a pole socket to connect the power line to the wall.
   电气工程师使用柱头插座将电源线连接到墙上。
2. 2.The carpenter needed a pole socket to hang the picture on the wall.
   木匠需要一个柱头插座来把画挂在墙上。
3. 3.The electrician installed a pole socket in the ceiling so that the lights could be easily turned on and off.
   电工在天花板上安装了柱头插座，以便可以轻松地打开和关闭灯。