furnace for brightness

例句：

1. 1.The furnace was so hot that it could not be touched.
   炉子太热了，无法触摸。
2. 2. The blacksmith used a furnace to shape metal.
   铁匠使用一个炉子来塑造金属。
3. 3. The fire in the furnace glowed brightly.
   炉中的火闪闪发光。