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What does it mean that people from other European countries immigrated to Germany in large numbers?

The fertility rate in Germany is very low.

Cihai's explanation of immigration is: 1. A person who emigrates to a certain area abroad for permanent residence;

2. A large number of organized population movements. The English words corresponding to these two definitions can be divided into immigration and resettlement, and migration can also be used as a general term for all kinds of immigrants. Immigration is the general term for population migration between different regions.