这个词是什么意思？
Stable yttrium atoms that have the same atomic number as the element yttrium, but differ in atomic weight. Y-89 is the only naturally occurring stable isotope of yttrium.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D015020 · MeSH 2026。
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