visual binary meaning in English
[double] 【天文学】幻视双星〔肉眼看为一单星，望远镜中看才能看出为双星〕。
Examples
- Wide visual binary
远距目视双星 - Binary systems in which both components can be seen are called visual binary stars
：若双星中所有成员皆可以看得到，我们便称之为目视双星。 - Sometimes , in a binary star system , one star will pass in front of the other producing what we call eclipsing binary . it can be treated as a special kind of visual binary . eclipsing binary systems are variable stars see below
：有些双星系统，其中一颗星会在另一颗星前经过，产生周期性的光度变化，我们称这种双星为食双星，基本上我们可以把食双星看成为目视双星的一种。