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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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更新时间:2025/1/8 15:12:16