cobalt

例句：

1. 1.Cobalt is a precious metal used in jewelry and electronics.
   钴是一种用于珠宝和电子产品的珍贵金属。
2. 2. The cobalt blue of the sky was breathtaking.
   天空的钴蓝色令人惊叹。
3. 3. The scientist discovered a new way to extract cobalt from its ore.
   这位科学家发现了一种新的方法，可以从其矿石中提取钴。