名词
中文翻译：Unknown
同义词：
['raw material', 'unprocessed material', 'coarse grinding']
例句：
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1. The raw materials for the new project are being collected now.
新项目所需的原材料正在收集中。
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2. The raw material is very expensive and it's hard to find a supplier.
这种原材料非常昂贵，很难找到供应商。
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3. The raw material was processed in a special way to make it more durable.
这种原材料经过特殊处理以使其更耐用。