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third rail

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Third rail \Third rail\ (Electric Railways)
   (a) The third rail used in the third-rail system.
   (b) An electric railway using such a rail. [Colloq.]

資料來源 : WordNet®

third rail
     n : a rail through which electric current is supplied to an
         electric locomotive
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