The pulley is fixedly installed on the wall, and the rope which is threaded through the pulley is connected with the lamp-socket, then the other end of the rope is connected with a fixed object.
其滑轮固定安装在墙上，灯座与穿过滑轮的绳索连接，绳索的另 一端与固定物连接。
2
Plug your tabletop lamp into a dimmer instead of the wall socket.
直接把你的台灯插到调光器上，而不用插到墙上的插座里。
3
When you purchase a lamp or a toaster, the "UL Certified" mark provides assurance that the appliance will plug into the socket in your wall and work with your home's electrical system.