... 光学目视双星 optical visual binary 光学双星 optical double star 光学天平动 optical libration ...
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... 光[学]深[度] optical depth 视双星；光学双星 optical double star 光学玻璃 optical glass ...
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N two stars that appear close together when viewed through a telescope but are not physically associated and are often separated by a great distance 光学双星; 当通过望远镜看时显得很近但并不相关且常常分开很远的两颗星 → compare binary star
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