A group of towns forming a continuous built-up area as a result of urban sprawl (also called metropolitan area). See the classification outlined by Raybould et al. (2000) Update 25, 2–4S; see also S. Brunn (2003).
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。