crucible belly

例句：

1. 1.The crucible belly of the furnace is where the metal is heated and transformed.
   炉子的坩埚腹部是金属加热和转变的地方。
2. 2.The crucible belly is a critical part of the process, where the metal is melted and refined.
   坩埚腹部是过程的关键部分，金属在这里被熔化和精炼。
3. 3. The crucible belly is also where the molten metal is poured out, ready for shaping.
   坩埚腹部也是熔融金属被倾倒出来的部分，准备进行成型。