这个词是什么意思？
Transmission of energy or mass by a medium involving movement of the medium itself. The circulatory movement that occurs in a fluid at a nonuniform temperature owing to the variation of its density and the action of gravity. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed; Webster, 10th ed)
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D018481 · MeSH 2026。
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