hot-blast main

例句：

1. 1. The hot-blast main is responsible for the combustion of the fuel and the generation of heat.
   热风炉主负责燃料的燃烧和产生热量。
2. 2. The hot-blast main is a crucial component in the operation of the furnace.
   热风炉主是炉子运行的关键部件。
3. 3. The hot-blast main is designed to withstand high temperatures and pressures, ensuring the safe and efficient operationof the furnace.
   热风炉主设计用于承受高温和压力，确保炉子的安全可靠运行。