flue
/fluː/noun
1- a duct for smoke and waste gases produced by a fire, a gas heater, a power station, or other fuel-burning installation烟道, 排气管：
as modifier flue gases.烟道排出的气。
1.1
- a channel for conveying heat供暖管。
词源
late Middle English (denoting the mouthpiece of a hunting horn)： of unknown origin. Current senses date from the late 16th cent.