这个词是什么意思？
Viscous materials composed of complex, high-molecular-weight compounds derived from the distillation of petroleum or the destructive distillation of wood or coal. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D013638 · MeSH 2026。
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