A type of migration which occurs in a series of movements, for example, moving to a town larger than the home town, but not directly to one of the city regions (Nilsson (2003) Urb. Studs 40, 7).
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。