垂直: perpendicular; vertical; squ ...火: fire道: road; way; route; path垂直火路: fire shaft火道: flame path; flue边火道: end flue防火道: firebreaks隔火道: fire break救火道: fire trail排火道: flame tu el; flame tunnel引火道: firing train lead直火焚烧炉: direct-flame incineration直火干燥机: flame dryer直火加热炉: direct firing furnace回转火道: reversing flue火道锅炉: flame tube boiler集合火道: collecting flue加肋火道: ribbed flue硫磺火道: sulfur vent炉底火道: sole flue上跨火道: crossover flue双联火道: hairpin flue; twinflue下降火道: down-flow flue垂直: perpendicular; vertical; squareness; verticality; perpendicularity 两线垂直相交。the two lines meet at right angles. 设 ab 垂直于 cd。let ab be perpendicular to cd. 当表面与射线垂直时，射线的强度最大。when a surface is perpendicular to the rays, their intensity is at its maximum 护林防火道路: protection forest fire-proof road
