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BNC: 10744 COCA: 8636

a tube or pipe that carries liquid or air, especially in and out of buildings or through the body管道,管线;(人体的)管,导管

Most office buildings have dozens of air ducts and vents.大多数办公楼都有很多通风管道和通风口。
People with blocked tear ducts cannot cry.泪管阻塞者流不出眼泪。

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