A ring of Neptune, fourth in order from the planet, named after F. Arago. It lies 57 600 km from Neptune’s centre and is less than 100 km wide.
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。