1
be a double star
双星系指从地球上看起来靠得很近的两颗星。
The pair is a double star visible with a telescope.
这对是双星，用望远镜可见。
物理双星
先理解核心含义，再看它在真实句子里的用法。
物理双星
A pair of stars that orbit around their common center of gravity; a binary star.
The pair is a double star visible with a telescope.
这对是双星，用望远镜可见。
两颗星组成一个恒星系统,围绕其引力场平衡点运行;即双星。
Two stars which form a stellar system, such that they orbit the point of equilibrium of their gravitational fields; a binary star.
肉眼看来像一颗星的两颗星,或因彼此绕行(双星),或因虽相距遥远却恰好在同一视线上(光学双星)。
Two stars that appear to be one when seen with the naked eye, either because they orbit one another (binary stars) or happen to be in the same line of sight even though they are separated by a great distance (optical binaries).
Through my telescope, I could clearly see the double star system in the constellation Lyra.
通过我的望远镜，我可以清楚地看到天琴座中的双星系统。
Our textbook explains that a double star can appear as one point of light to the naked eye.
我们的教科书解释说，双星用肉眼看起来可能只是一个光点。
I spent the whole night photographing a beautiful double star near the Milky Way.
我花了整夜拍摄银河附近一颗美丽的双星。
双星系指从地球上看起来靠得很近的两颗星。
The pair is a double star visible with a telescope.
这对是双星，用望远镜可见。
Astronomers observed the system as a double star.
天文学家观测到这个系统是一对双星。
The binary system consists of a double star.
该双星系统由一对双星组成。
Not this
There are many double star in the sky.
Use this
There are many double stars in the sky.
double star 是可数名词，复数形式应加-s，表示多对双星。
Not this
a star double
Use this
a double star
英语中形容词通常放在名词前，'double star'是固定短语，不能颠倒词序。
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可数名词，常用单数形式
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.