直接成本就是提供产品和服务所需要的成本(也就是直接原料和直接人工投入)。
Direct costs are classified as the costs that go into creating the product or service (that is, direct materials and direct labor).
新工艺的主要改进为氯化钾原料不经精制而直接碳化，从而在成本相仿的情况下提高了产品档次。
With improvement unrefined potassium chloride is directly subjected to carbonization and therefore raises the product quality with similar cost.
热剂反应是自蔓延高温合成反应的一个分支，它采用成本低廉的天然氧化物作原料，比元素直接合成材料具有更显著的经济效益。
Thermit reaction, a embranchment of SHS, USES the natural oxide as a low cost raw material, which has more prominent economic profits than the direct-compounded material with elements.
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