corundum
n[U]
hard crystallized mineral used chiefly in abrasives, or in powder form for polishing 刚玉; 刚石; 金刚砂.
🏥 医学释义
金刚砂,刚玉
🗣️ 情景例句
They're getting divorced.
他们快要离婚了。
Let me tell you about our product.
关于产品一事让我向你说明。
New Zealand is an impotant agricultural country with a small population. In size it is bigger than Guangdong Province, yet has a much smaller population.