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  1. Oxford Dictionary

    third rail

    • n.
      an additional rail supplying electric current, used in some electric railway systems.；a subject considered by politicians to be too controversial to discuss

    • noun: third rail, plural noun: third rails

    • 釋義

    名詞

    • 1. an additional rail supplying electric current, used in some electric railway systems.
    • 2. US informal a subject considered by politicians to be too controversial to discuss until very recently, the conventional wisdom said that Social Security was the third rail of politics