Corundum
[kә'rʌndәm]
解釋/意思:
(n.) The earth alumina, as found native in a crystalline state, including sapphire, which is the fine blue variety; the oriental ruby, or red sapphire; the oriental amethyst, or purple sapphire; and adamantine spar, the hair-brown variety. It is the hardest substance found native, next to the diamond.
卡洛斯錄入
解釋/意思:
n. a mineral consisting of mere alumina yet of great specific gravity—about four times that of water—and second in hardness only to the diamond.
校對:潘西