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1. Oxford Dictionary

   planetary nebula

   • n.
     a ring-shaped nebula formed by an expanding shell of gas round an ageing star.

   • noun: planetary nebula, plural noun: planetary nebulae

2. • 更多解釋

   planetary nebula

   • IPA[ˈplanəˌterē ˈnebyələ]

   • n.
     a ring-shaped nebula formed by an expanding shell of gas around an aging star.

   Oxford American Dictionary