corundum
US /kəˈrʌndəm/
UK /kəˈrʌndəm/
名词
刚玉
a very hard mineral consisting of aluminum oxide, occurring in crystalline form as sapphire or ruby and used as an abrasive
示例:
•
Sapphire and ruby are both forms of corundum.
蓝宝石和红宝石都是刚玉的一种。
•
Due to its hardness, corundum is often used in abrasives.
由于其硬度，刚玉常用于磨料。