A former country on the south-west Arabian peninsula. It declared its independence in 1967 and, after long negotiations, amalgamated in 1989 with the Yemen Arab Republic to form Yemen.
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。