ro·tun·da /roˈtʌndə/
 圓形建築,圓形大廳


 Ro·tun·da n.  Arch. A round building; especially, one that is round both on the outside and inside, like the Pantheon at Rome. Less properly, but very commonly, used for a large round room; as, the rotunda of the Capitol at Washington.

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 rotunda
      n 1: a building having a circular plan and a dome
      2: a large circular room