immigration
  外來的移民,移居入境
  Im·mi·gra·tion n.  The act of immigrating; the passing or coming into a country for the purpose of permanent residence.
     The immigrations of the Arabians into Europe.   --T. Warton.
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  immigration
       n 1: migration into a place (especially migration to a country of
            which you are not a native in order to settle there)
            [syn: in-migration]
       2: the body of immigrants arriving during a specified interval;
          "the increased immigration strengthened the colony"