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1. Oxford Dictionary

   metric system

   英式

   • n.
     the decimal measuring system based on the metre, litre, and gram as units of length, capacity, and weight or mass. The system was first proposed by the French astronomer and mathematician Gabriel Mouton (1618–94) in 1670 and was standardized in Republican France in the 1790s.

   • noun: metric system, plural noun: metric systems