单词 | parsec |
释义 | par·sec (pärsĕk′) n. A unit of astronomical length based on the distance from Earth at which stellar parallax is one second of arc and equal to 3.258 light-years, 3.086 × 1013 kilometers, or 1.918 × 1013 miles. [PAR(ALLAX) + SEC(OND)1.] |
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