What raw materials do you use?
你们使用什么原材料？
What is particular about the raw materials it is not ah?
什么是特别关注的原料是不啊？
What troubles me is that the supply of raw materials is not ensured.
使我担忧的是原料供应没有保证。
Then what are the other raw materials for ironmaking?
那么其它炼铁原料是什么呢？
Then what are the other raw materials for ironmaking?
那么其它炼铁原料是什么呢？
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