An enclosed tube or channel for carrying air or gas.

• A pipe that conveys liquids within a system.

输送空气或气体的封闭管道或通道。

• 在系统内输送液体的管道。

An enclosure for routing electrical or data cables.

• A protective passage for conductors.

用于敷设电缆或数据线的管道或槽道。

• 保护导线的通道。

A bodily tube that carries secretions such as bile or tears.

• A vessel that drains or delivers glandular fluids.

输送胆汁、泪液等分泌物的体内导管。

• 排出或输送腺体液的管道。

A tube-like cavity in plant tissue for sap or resin.

• A plant vessel that conducts water, sap, or air.

植物组织中输送树液或树脂的细长腔道。

• 传导水、汁液或空气的植物导管。

A layer that traps and guides radio or sound waves.

• A refractive channel in the atmosphere or ocean.

使无线电或声波被束缚并导引的层。

• 大气或海洋中的折射导波通道。

To enclose or route through a duct or ducts.

• To channel a flow by using ducts.

用导管包覆或通过导管引导。

• 用管道将流体或气流引导。

Archaic: guidance or direction.

• Archaic: conduct or leading.

古义：引导；指导。

• 古义：带领。