hot-blast furnace

例句：

1. 1. The hot-blast furnace is the heart of the steel production process.
   高炉是钢铁生产流程的核心。
2. 2.The hot-blast furnace is a complex machine that requires skilled maintenance.
   高炉是一种复杂的机器，需要熟练的维护。
3. 3.The hot-blast furnace produces molten iron from raw materials such as iron ore and coal.
   高炉将铁矿石和煤炭等原材料转化为熔融铁。