这个词是什么意思？
An element of the rare earth family of metals. It has the atomic symbol Yb, atomic number 70, and atomic weight 173. Ytterbium has been used in lasers and as a portable x-ray source.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D015018 · MeSH 2026。
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