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1. 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。

2. He called for a halt to the recent wave of emigration.

他呼吁停止近期的移民潮.

3. Increase in population made emigration necessary.

人口的增加使向外移民成为必要.

4. During the early sixth century emigration from Britain to Brittany was at its height.

6世纪初，从不列颠涌向布列塔尼的移民潮达到了高峰。

5. The authorities have failed so far to enact a law allowing unrestricted emigration.

到目前为止，当局未能通过允许自由移民的法律。