n.移居外国，迁移出境，（总称）移民
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。
Increase in population made emigration necessary.
人口的增加使向外移民成为必要.
He called for a halt to the recent wave of emigration.
他呼吁停止近期的移民潮.
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