So, in 2019, the base units that make up the foundation of the metric or SI system were redefined to no longer rely on imperfect human artifacts.
因此，在 2019 年，构成公制或 SI 系统基础的基本单位被重新定义为不再依赖不完美的人类工件。
SI system
原声例句
PBS趣味科普
中文百科
国际单位制 International System of Units
（重定向自SI system）
国际单位制（符号：SI，来自法语：Système International d'Unités），源自公制或米制，旧称万国公制，是世界上最普遍采用的标准度量衡单位系统，采用十进制进位系统。是18世纪末科学家的努力，最早于法国大革命时期的1799年被法国作为度量衡单位。国际单位制是在公制基础上发展起来的单位制，于1960年第十一届国际计量大会通过，推荐各国采用，其国际缩写为SI。
英语百科
International System of Units 国际单位制
（重定向自SI system）
![Stone marking the Austro-Hungarian/Italian border at Pontebba displaying myriametres, a unit of 10 km used in Central Europe in the 19th century (but since deprecated).[2][3]](/uploads/202502/11/Alter_Grenzstein_Pontebba_012555.jpg)
![ThomsonMaxwellWilliam Thomson (Lord Kelvin) and James Clerk Maxwell played a prominent role in the development of the principle of coherence and in the naming of many units of measure.[11][12][13][14][15]](/uploads/202502/11/William_Thomson_1st_Baron_Kelvin2555.jpg)
The International System of Units (French:Système international d'unités, SI) is the modern form of the metric system, and is the most widely used system of measurement. It comprises a coherent system of units of measurement built on seven base units. It defines twenty-two named units, and includes many more unnamed coherent derived units. The system also establishes a set of twenty prefixes to the unit names and unit symbols that may be used when specifying multiples and fractions of the units.
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