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单词 galactic disc
释义

galactic disc

(US galactic disk)
noun
(Originally) the disc of the galaxy, as represented in the sky by the Milky Way; (later also) the relatively thin, disc-shaped outer part of any spiral galaxy.

Origin

Mid 19th century; earliest use found in The Eclectic Magazine.

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更新时间:2024/11/11 10:25:45