“natural activity”概念、定义、翻译-科学时代

单词	natural activity
释义	环境科学与工程词汇手册 natural activity 天然放射性
随便看	educational reference book educational reform educational regularity educational regulation educational relevance Educational Renaissance educational reorganization educational repercussion educational research educational research and development educational researcher educational research institution educational research project educational resource educational responsibility educational result educational retard educational retardation educational return educational review educational revolution educational right educational role educational rule educational running cost

科学时代收录了1160609条科普词条，基本涵盖了常见科普常识及英语词汇的翻译，是科学学习和研究的有利工具。