这个词是什么意思？
Metals with high specific gravity, typically larger than 5. They have complex spectra, form colored salts and double salts, have a low electrode potential, are mainly amphoteric, yield weak bases and weak acids, and are oxidizing or reducing agents (From Grant & Hackh's Chemical Dictionary, 5th ed)
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D019216 · MeSH 2026。
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