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21. | epidemiology of immigration |
| 移民流行病学 |
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22. | net immigration |
| 纯移民 |
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23. | women migrant worker |
| 移民女工 |
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24. | immigrant service |
| 移民服务 |
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25. | immigration problem |
| 移民问题 |
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26. | business migrant |
| 投资移民 |
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27. | returning emigrant |
| 回流移民 |
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28. | immigrant education |
| 移民教育 |
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29. | immigration controls |
| 移民管制. |
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30. | economic migrants |
| 经济移民 |
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