英语词汇proper motion怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	proper motion
释义	proper motionn. Astron. the part of the apparent motion of a fixed star etc. that is due to its actual movement in space relative to the sun 【天】自行
随便看	gelid gelignite gelly gelsemium gem Gemara geminal geminally geminate gemination Gemini Geminian gemlike gemma gemmation gemmiferous gemmiparous gemmologist gemmology gemmule gemmy gemsbok gemstone gemütlich Gen.

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