“secondary（sampling）unit”概念、定义、翻译-科学时代

单词	secondary（sampling）unit
释义	数学词汇手册 secondary（sampling）unit 二级单元
随便看	mechanical energy mechanical energy mechanical energy mechanical environment mechanical equilibrium mechanical equilibrium condition mechanical equivalent mechanical equivalent mechanical equivalent mechanical equivalent of heat mechanical equivalent of heat mechanical equivalent of light mechanical equivalent of light mechanical erosion mechanical exhaust system mechanical failure mechanical failure load mechanical feed mechanical feed mechanical feeder mechanical feeder mechanical fiducial mark mechanical filling mechanical filling mechanical filtration

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。