Cobaltitite
[建] 辉钴矿
🗣️ 情景例句
These knives are guaranteed never to go blunt.
这些刀保证不会变钝。
Did you tell him yourself?
你自己亲自告诉他吗？
He has worked there since it opened in 1989.
从1989年这家工厂开办起，他就在这儿工作。