slag

中文： 矿渣、火山渣

1. Waste material from a mine. (countable, uncountable)
2. Scum that forms on the surface of molten metal. (countable, uncountable)
3. Impurities formed and separated out when a metal is smelted from ore; vitrified cinders. (countable, uncountable)
4. Hard aggregate remaining as a residue from blast furnaces, sometimes used as a surfacing material. (countable, uncountable)
5. Scoria associated with a volcano. (countable, uncountable)

复数 slags