这个词是什么意思？
A system of physical units in which the fundamental quantities are length, time, mass, electric current, temperature, luminous intensity, and amount of substance, and the corresponding units are the meter, second, kilogram, ampere, kelvin, candela, and mole. The system has been given official status and recommended for universal use by the General Conference on Weights and Measures.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D007394 · MeSH 2026。
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