emigration [ˌɛmɪˈɡreʃən]

例句:

• Emigration was still theoretically a matter of choice.
  从理论上讲，移民仍是个个人选择的问题。
  来自柯林斯例句
• He called for a halt to the recent wave of emigration.
  他呼吁停止近期的移民潮.
  
• Increase in population made emigration necessary.
  人口的增加使向外移民成为必要.
  
• This emigration is causing serious losses for the society.
  来自VOA
• Following the war, emigration added to the population decline.
  来自VOA
• Russia has had free emigration ever since it became independent.
  来自VOA