| 单词 | relative proper motion |
| 释义 | Definition of relative proper motion in English:relative proper motionnoun Astronomy
OriginLate 18th century; earliest use found in William Herschel (1738–1822), musician and astronomer. Definition of relative proper motion in US English:relative proper motionnoun Astronomy
OriginLate 18th century; earliest use found in William Herschel (1738–1822), musician and astronomer. |
| 随便看 |
英汉双解词典包含464360条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。