这个词是什么意思？
An atom or group of atoms that have a positive or negative electric charge due to a gain (negative charge) or loss (positive charge) of one or more electrons. Atoms with a positive charge are known as CATIONS; those with a negative charge are ANIONS.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D007477 · MeSH 2026。
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