proper motion
英
美
- n. [天]自行；天体之固有运动
双语例句
- Risk the illegal website proper motion that establishs with stockjobber name to shut.
冒用证券公司名义设立的非法网站自行关闭。 - However, if its membership can be confirmed by proper motion and radial velocity determinations, the cause of light variation may not be pulsation.
但是，如果自行或视线速度测定证实为其成员星，那么变光的原因也许不是脉动。
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