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单词 subbasal
释义

WordReference Random House Unabridged Dictionary of American English © 2024
sub•base  (subbās′),USA pronunciation n. 
  1. Architecturethe lowest part of a base, as of a column, that consists of two or more horizontal members.
  2. Mathematicsa collection of subsets of a topological space having the property that every open set of a given topology can be written as the union of intersections of finite numbers of sets in the collection. Cf. base 1 (def. 13b).
  • sub- + base1 1820–30
sub•basal, adj. 

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