a pipe or tube carrying liquid, gas, electric or phone wires, etc. （传送液体、气体、电线、电话线等的）管道，管子 a heating/ventilation duct 暖气导管；通风道 Air flows through the ventilation ducts. 空气流经通风管道。 They managed to get out of the building by crawling through a ventilation duct. 他们设法顺着通风管道爬出了大楼。
a tube in the body or in plants through which liquid passes （人体或植物体内输送液体的）管，导管
Word Originmid 17th cent. (in the sense ‘course’ or ‘direction’): from Latin ductus ‘leading, aqueduct’ from duct- ‘led’, from the verb ducere.