这个词是什么意思？
The tendency of a gas or solute to pass from a point of higher pressure or concentration to a point of lower pressure or concentration and to distribute itself throughout the available space. Diffusion, especially FACILITATED DIFFUSION, is a major mechanism of BIOLOGICAL TRANSPORT.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D004058 · MeSH 2026。
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