ingot dogs

例句：

1. 1.The forge is melting the ingots to make new ones.
   熔炉正在熔化生铁来制造新的。
2. 2. The blacksmith uses an ingot as a raw material.
   铁匠用生铁作为原材料。
3. 3.The ingot was melted down and used to make tools.
   生铁被熔化并用于制作工具。