up·per·most /ˈʌpɚ/
  (a.)最上的,最高的,最上面的(ad.)在最上,最初,首先
  Up·per·most a.  Highest in place, position, rank, power, or the like; upmost; supreme.
     Whatever faction happens to be uppermost.   --Swift.
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  uppermost
       adj : at or nearest to the top; "the uppermost book in the pile";
             "on the topmost step" [syn: topmost, upmost]
       adv 1: in or into the most prominent position, as in the mind; "say
              what comes uppermost"
       2: in or into the highest position; "the blade turned
          uppermost"