2. In plain carbon steel, carbon is the only alloy element. 只有在普碳钢中,碳才是唯一的合金元素。
3. All by itself, this shift lowers the carbon intensity of an economy. 单是这种变迁本身,就会降低一个经济体的碳强度。
英英解释
n.
1. an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon an
2. a thin paper coated on one side with a dark waxy substance (often containing carbon); used to transf
3. a copy made with carbon paper