1.technicalTBC a pipe or passage through which water, gas, a set of electricwires etc passes 〔水、气、电线等的〕管道,导管
2formalTAKE/BRING a connection between two things that allows people to pass ideas, news, money, weapons, drugs etc from one place to another 〔传递想法、新闻、金钱、武器、毒品等的〕渠道,通道
conduit for
Drug traffickers have used the country as a conduit for shipments to the U.S.