这个词是什么意思？
The interchange of goods or commodities, especially on a large scale, between different countries or between populations within the same country. It includes trade (the buying, selling, or exchanging of commodities, whether wholesale or retail) and business (the purchase and sale of goods to make a profit). (From Random House Unabridged Dictionary, 2d ed, p411, p2005 & p283)
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D003132 · MeSH 2026。
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