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1. Oxford Dictionary

   Halley's comet

   • ph.
     a periodical comet with an orbital period of about 76 years, its reappearance in 1758–9 having been predicted by Edmond Halley. It was first recorded in 240 bc and last appeared, rather faintly, in 1985–6.
2. • 更多解釋

   Halley's comet

   • IPA[ˌhalēz ˈkämət]

   美式

   • ph.
     a periodical comet with an orbital period of about 76 years, its reappearance in 1758–59 having ...

   Oxford American Dictionary