a duct for smoke and waste gases produced by a fire, a gas heater, a power station, or other fuel-burning installation 烟道,气体管 [as modifier]flue gases. 烟道排出的气。 ■a channel for conveying heat 供暖管
语源
late Middle English (denoting the mouthpiece of a hunting horn): of unknown origin. Current senses date from the late 16th cent