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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

    • 釋義

    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