| met. |
charcoal; charcoal (① In the simplest method of case-hardening the steel articles are packed in boxes containing charcoal and other substances; they are then heated gradually to about 925°C， and maintained at that temperature for several hours. 最简单的表面硬化法是将钢件放人盛有木炭和其他材料的箱子中，然后逐渐加热到大约 925°C, 并在此温度下保持几小时。② In early times, iron ore was heated in a charcoal fire； when the fire died down, a spongy mass of iron remained which could be hammered into shape and used for tools and weapons. 古时候，铁矿石是在木炭火中加热的。火熄灭后留下了海绵铁块。它可以锤打成形，用于制造工具和武器。) |
