“secondary unit”概念、定义、翻译-科学时代

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。

单词	secondary unit
释义	人口学词汇手册 secondary unit 二级单位
随便看	full duplex full duplex Full Duplex Handshaking Protocol (FDHP) full duplex transmission full-duplex transmission full duration half maximum full duration half maximum (FDHM) full duration half maximum--full duration half maximum (FDHM) full earth full-earth brightness full-earth illumination full effect recording full electronic shutter full electronic shutter (FES) full electronic switching system full-elliptic spring full embedding full employment full employment full employment full employment full-employment budget full-employment budget surplus full-employment national income full-employment unemployment rate