da·is /ˈdeəs, &dɪvɪdɛ;ˈdaɪ-/
  台,講臺
  Da·is n.
  1. The high or principal table, at the end of a hall, at which the chief guests were seated; also, the chief seat at the high table. [Obs.]
  2. A platform slightly raised above the floor of a hall or large room, giving distinction to the table and seats placed upon it for the chief guests.
  3. A canopy over the seat of a person of dignity. [Obs.]
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  dais
       n : a platform raised above the surrounding level to give
           prominence to the person on it [syn: podium, pulpit,
           rostrum, ambo, stump, soapbox]