A fragile ecosystem area where the conservation or preservation of the natural environment is sustained by state controls and/or grants, such as the eastern South Downs, UK (Boardman (2003) TIBG 28, 2).
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。