molten cast iron(It was discovered that the addition of small amounts-only about 0.04 per cent-of magnesium, or cerium, to molten cast iron would cause the metal when solidified to form the graphite into small nodules instead of flakes. 人们发现，向熔化的铸铁中添加少量，哪怕是仅0.04%左右的镁或铈，就会使铸铁在凝固时形成小球状石墨，而不是片状石墨。)
grade of iron(According to the types of ores used and the grade of iron manufactured, slags with different physical and chemical properties are produced. 根据所使用的矿石类型和所炼制的铁的牌号，人们造出了物理、化学性能各异的炉渣。)
