金刚烃

例句：

1. 1. The diamond is the hardest natural substance known to man.
   钻石是已知的人类最硬的自然物质。
2. 2. Diamonds are used in jewelry and industrial applications.
   钻石用于珠宝和工业应用。
3. 3. The diamond mine was discovered in Africa, where it is mined for its high value.
   钻石矿在非洲被发现，因其高价值而被开采。