Still, there's a problem: it is hard to collect enough kitchen waste — a key raw material for the upcoming facility — despite the fact that half of urban waste comes from the kitchen.
不过，这里还有个问题：他们很难收集到足够的厨房垃圾——新工厂的主要原料——尽管城市废物的一半都来自厨房。
Tough negotiations over prices are heating up between the worlds biggest steelmakers and the suppliers of a key raw material, iron ore.
全球大型钢铁厂商与其主要原材料铁矿石的供应商在价格问题上的艰苦谈判变得日趋激烈。
The clean coal, the key raw material of the coking plant is stored mainly in open coal yard. Such coal autoignition is a big hidden trouble to the coal storage.
洗精煤是焦化厂的主要原料，多在煤场露天存放，煤的自燃性对焦化厂储煤形成了很大的隐患。
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