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1. Oxford Dictionary

   event horizon

   • n.
     a notional boundary around a black hole beyond which no light or other radiation can escape.；a point of no return

   • noun: event horizon, plural noun: event horizons

2. • 釋義

   n.

   名詞

   • 1. a notional boundary around a black hole beyond which no light or other radiation can escape.
   • ▪ a point of no return we're nearing the event horizon of the presidential election