1. They watched workers loading open-hearth furnace. 
   他们观看了工人给平炉加料。
2. a process for making steel using an open-hearth furnace. 
   用敞开口的床式反射炉生产钢的过程。
3. A furnace or hearth where metals are heated or wrought; a smithy. 
   锻铁炉一种熔炉或熔床，金属可在其上高温加热并锻打成形
4. The outer wall and casing of a blast furnace above the hearth. 
   壁炉上的外墙壁炉地面上方鼓风炉子的外墙或铸件
5. Loose sand or ore used to line the hearth of a reverberatory furnace in preparation for pouring molten metal. 
   涂炉膛材料为倒入熔化的金属作准备的用来修整反射炉炉膛的松散砂子或矿渣

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• 1. 炉底导电的炉子
  conducting elements mosaic || 导电点镶嵌幕...conducting hearth furnace || 炉底导电的炉子...conducting island || (硅靶的)导电岛, 导电微区
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