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1. Oxford Dictionary

   fundamental unit

   • n.
     each of a set of unrelated units of measurement, which are arbitrarily defined and from which other units are derived. For example, in the SI system the fundamental units are the metre, kilogram, and second.；a thing that is or is perceived as being the smallest part into which a complex whole can be analysed

   • noun: fundamental unit, plural noun: fundamental units

2. • 釋義

   n.

   名詞

   • 1. each of a set of unrelated units of measurement, which are arbitrarily defined and from which other units are derived. For example, in the SI system the fundamental units are the metre, kilogram, and second.
   • ▪ a thing that is or is perceived as being the smallest part into which a complex whole can be analysed the house is the fundamental unit of Basque society