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1. Oxford Dictionary

   double star

   • n.
     two stars actually or apparently very close together.

   • noun: double star, plural noun: double stars

2. • 更多解釋

   double star

   • IPA[ˈdəbəl stär]

   • n.
     two stars physically very close together, as a binary star, or apparently so, as an optical double.

   Oxford American Dictionary