yttrium

例句：

1. 1.This is the first element in the periodic table of elements.
   这是元素周期表中的第一个元素。
2. 2.The chemical properties of yttrium are similar to those of lanthanum.
   钇的化学性质与镧相似。
3. 3.Yttrium is a rare and valuable metal that is used in many industrial processes.
   钇是一种稀有且有价值的金属，用于许多工业过程。