“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	road network road network planning road network structure road of nationwide fitness road on saline zone road on soft clay ground road parking road passenger transportation road passenger transport terminal road pavement cleaning equipment road pavement structure health monitoring system road plane crossing facilities road plane design road planting road pricing road profile design road protection forest road protection greenbelt road race of Summer Paralympics road reconstruction and expansion road safety road section design Road service level roadside clearance roadside infrastructure

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。