emigration
  移民,移居
  em·i·gra·tion /ˌɛməˈgreʃən/ 名詞
  遷出,血細胞滲出
  Em·i·gra·tion n.
  1. The act of emigrating; removal from one country or state to another, for the purpose of residence, as from Europe to America, or, in America, from the Atlantic States to the Western.
  2. A body emigrants; emigrants collectively; as, the German emigration.
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  emigration
       n : migration from a place (especially migration from your
           native country in order to settle in another) [syn: out-migration,
            expatriation]