Zr

例句：

1. 1. The ruby in the necklace is a rare Zr gemstone.
   项链上的红宝石是一颗稀有的锆石。
2. 2. The scientist used Zr to create a new type of material.
   科学家用锆石创造了一种新型材料。
3. 3. Zr is often used as an additive in cement and concrete.
   锆石常被用作水泥和混凝土的添加剂。