| 单词 | parsec |
| 释义 | parsec /pahr"sek'/, n. Astron. a unit of distance equal to that required to cause a heliocentric parallax of one second of an arc, equivalent to 206,265 times the distance from the earth to the sun, or 3.26 light-years. [1910-15; PAR(ALLAX) + SEC(OND)2] |
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