The commuting area around a city. Bretagnolle and Pumain (2001) Cybergeo 335 show that this area varies according to the definition of ‘city’.
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。