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Parsec
01
秒差距, 天文单位
a unit of astronomical distance equivalent to about 3.26 light-years
Example
Astronomers use parsec to measure distances to stars and galaxies.
天文学家使用秒差距来测量星星和星系的距离。
The Milky Way galaxy has a diameter of tens of thousands of parsecs.
银河系的直径达到数万秒差距,天文单位。
