ag·gre·ga·tion /ˌægrɪˈgeʃən/
 集合,聚合,集合體
 aggregation
 聚合
 Ag·gre·ga·tion n.  The act of aggregating, or the state of being aggregated; collection into a mass or sum; a collection of particulars; an aggregate.
    Each genus is made up by aggregation of species.   --Carpenter.
    A nation is not an idea only of local extent and individual momentary aggregation, but . . . of continuity, which extends in time as well as in numbers, and in space.   --Burke.
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 aggregation
      n 1: several things grouped together or considered as a whole
           [syn: collection, accumulation, assemblage]
      2: the act of gathering something together [syn: collection,
         collecting, assembling]