slag shell

例句：

1. 1. The furnace was clogged with slag, making it difficult to heat the metal.
   炉膛被熔渣堵塞，加热金属变得困难。
2. 2. The slag shell was removed from the furnace before we could start producing steel.
   在开始生产钢铁之前，我们先把炉膛里的熔渣壳移除了。
3. 3.The slag shell is a waste product that needs to be disposed of properly to prevent environmental pollution.
   熔渣壳是一种废物产品，需要妥善处理以防止环境污染。