duct
n
1 tube or channel carrying liquid, gas, electric or telephone wires, etc; (esp in an air-conditioning system) tube through which air passes (液體、 氣體、 電線或電話線等通過的)管道, 槽; (尤指空調系統中的)輸氣管
One of the air-ducts has become blocked. 有一條輸氣管堵塞了.
2 tube in the body or in plants through which fluid, etc passes 人體中或植物中液體等經過的管: `tear-ducts 淚管.