硬碳是指难以被石墨化的碳，是高分子聚合物的热分解。
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马琳硬碳 YCA
浸碳硬化深层 carburized case depth ; carburized cottom depth ; carburized cautomotive service engineers depth
碳酸盐硬度 KH ; carbonate hardness
渗碳硬化 carburized hardening ; brinelling ; nitrieren ; carbon case hardening
碳化钨硬质合金 diamondite ; carboloy ; carballoy
固体渗碳硬化钢 Harvey Steel
硬碳膜 hard carbon films
结构用硬碳素钢 Structural Carbon Steel Hard
超硬碳素钓鱼竿 super hard carbon fishing rod
The hard carbon had great significance to the adsorption and final fate of organic pollutants in the soil.
硬碳对于土壤中有机污染物的吸附和最终归趋有着重大的意义。
参考来源 - 不同性质土壤中PAHs老化行为及不同提取剂提取效率的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
这些内圈是碳铬钢制造的，并经过淬硬和研磨。
They are made of carbon chromium steel and are hardened and ground.
钢含碳的成分越多，冷却得越快，那么钢就越硬。
The more carbon the steel contains and the quicker the cooling is, the harder the steel becomes.
岩性主要为砾岩、泥岩、碳质泥岩、硬脆性泥岩、玄武岩、泥化玄武岩、石英岩及花岗岩等。
The lithology consists of conglomerate, shale, carbonolite, hard brittle shale, basalt, pelitized basalt, quartzite and granite, etc.
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