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  1. Oxford Dictionary

    nebula

    • IPA[ˈnɛbjʊlə]

    英式

    • n.
      a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.；a galaxy.

    • noun: nebula, plural noun: nebulae

    • 釋義

    名詞

    • 1. a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.
    • ▪ dated a galaxy.
    • 2. a clouded spot on the cornea causing defective vision.