Fluesflu:z 基本例句 弗卢埃斯 The gas burning and air preheating procedure in flues operates on a cyclic basis in which some flues are burning gas and others are giving up their heat to incoming combustion air. 烟道中煤气的燃烧和空气的预热是循环进行的，当某些烟道正燃烧煤气时，另一些烟道则在加热导入的供燃烧用的空气。 tdict