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a/an + binary star
The system is a binary star.
这个系统是一个双星。
双星；双星系统
先理解核心含义，再看它在真实句子里的用法。
双星；双星系统
A stellar system consisting of two stars that orbit around their common center of mass; a double star.
The system is a binary star.
这个系统是一个双星。
两颗恒星围绕共同质心运行的双星系统；双星。
A stellar system in which two stars orbit around their common center of mass; double star.
A binary star system consists of two stars orbiting a common center of mass.
双星系统由两颗围绕共同质心运行的恒星组成。
Astronomers discovered a new binary star in our galaxy.
天文学家在我们的银河系中发现了一颗新的双星。
The two stars in a binary star can be very close or far apart.
双星中的两颗星可以非常接近或相距甚远。
The system is a binary star.
这个系统是一个双星。
We studied binary star evolution.
我们研究了双星演化。
Binary stars are common in the galaxy.
双星在银河系中很常见。
Not this
I saw binary star in the sky.
Use this
I saw a binary star in the sky.
可数名词短语 single binary star 前需加不定冠词 a/an，否则不符合英语语法。
Not this
He studies binary.
Use this
He studies binary stars.
binary 单独使用通常指二进制系统而非双星，应使用完整短语 binary stars 表示研究内容。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use binary star naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
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.