sum·mit /ˈsʌmət/
 頂點,最高階層(a.)政府首腦的
 Sum·mit n.
 1. The top; the highest point.
    Fixed on the summit of the highest mount.   --Shak.
 2. The highest degree; the utmost elevation; the acme; as, the summit of human fame.
 3. Zool. The most elevated part of a bivalve shell, or the part in which the hinge is situated.
 Summit level, the highest level of a canal, a railroad, or the like, in surmounting an ascent.
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 summit
      n 1: the highest level or degree attainable; "his landscapes were
           deemed the acme of beauty"; "the artist's gifts are at
           their acme"; "at the height of her career"; "the peak of
           perfection"; "summer was at its peak"; "...catapulted
           Einstein to the pinnacle of fame"; "the summit of his
           ambition"; "so many highest superlatives achieved by
           man"; "at the top of his profession" [syn: acme, height,
            elevation, peak, pinnacle, superlative, top]
      2: the top point of a mountain or hill; "the view from the peak
         was magnificent"; "they clambered to the summit of
         Monadnock" [syn: peak, crown, crest, top, tip]
      3: a meeting of heads of governments [syn: summit meeting]
      v : reach the summit of a mountain; "Many mountaineers go up Mt.
          Everest but not all summit"