(1)(水，气等入楼)总管，(入楼的供电)主线(principal pipe in a distributing system for water，gas，etc or principal cable carrying electricity(into a building))[C]：a gas/a heating/an electric～煤气总管/暖气总管/电源线;The severe cold caused a water～to burst.严寒把输水总管冻裂了。

(2)污水总管(chief sewer pipe taking wastewater，etc out from a building)[C]：a sewer～下水管道;The～of the building needs repairing.楼房的下水总管需要修理。

(3)供(排)水(气)管道(网)，输电线路(网)(pipes or wires used to carry water，gas or electricity supply(to the system of a building or an area))[pl][接sing or pl动词]：a new house with no～s electricity supply未接输电线路的新房子;The building isn't on the～s.这幢楼房没有接通供水管和输电线网。Gas/Water/Electricity is turned off at the～s.煤气/供水/供电已被切断源头。～s gas/water/electricity/voltage供气处/供水处/供电处/电源电压;a～s radio/shaver外接电源收音机/剃刀