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| 光年等于9.4605 x 1012公里 | |||
| 光年 | |||
| 光年一光年为电磁辐射在一年内的行程，等于9.4605 × 10¹⁵ 米; 光年=9.463 ×10¹²千米 | |||
| English thesaurus | |||
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| lt-yr | |||
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| LY | |||
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