lanthana

例句：

1. 1. The lanthana elements are a group of metals with similar properties.
   镧系元素是一组具有相似性质的金属。
2. 2. Lanthana compounds have been used in various applications such as catalysis and luminescence.
   镧化合物在各种应用中被使用，如催化和发光。
3. 3. The lanthana series is named after the element's name, which means "light" in Latin.
   镧系列是以该元素的拉丁语名称命名的，意为“光”。