[] the central part of a telephone system used by a company, etc., where telephone calls are answered and connected (put through) to the appropriate person or department; the people who work this equipment（电话的）交换机，交换台，总机；总机话务员◆a switchboard operator交换台接线员◆Call the switchboard and ask for extension 410.先打电话给总机，然后要求转分机 410.