这个词是什么意思？
The prototypical element in the rare earth family of metals. It has the atomic symbol La, atomic number 57, and atomic weight 138.91. Lanthanide ion is used in experimental biology as a calcium antagonist; lanthanum oxide improves the optical properties of glass.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D007811 · MeSH 2026。
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