“proper motion”的概念、定义、翻译、参考文献-科学参考

单词	proper motion
释义	proper motion Encyclopedia 理学天体测量学释 proper motion自行恒星在一年内沿着垂直于视线方向走过的距离对观测者所张的角度。其单位为角秒/年。 Mathematics proper motion正常运动，固有运动 Astronomy proper motion缩写：P.M.。自行
随便看	counter- counter acting force counteraction counter anti-radiation attack counter appeal counterattack crusher counterattraction counter-balance counterbalance counterbalanced design counter balanced fork lift truck counterboring counterbuffer counterchange counter clockwise counterclockwise counterclockwise direction counterclockwise hysteresis loop counterclockwise rotation counter-countermeasure to polygraph testing counter culture Counterculture Movement counter current countercurrent counter current chromatography

科学参考收录了854744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。