un·com·mon /ˌʌnˈkɑmən/
  (a.)不尋常的,不凡的,罕有的(ad.)非常地
  Un·com·mon a. Not common; unusual; infrequent; rare; hence, remarkable; strange; as, an uncommon season; an uncommon degree of cold or heat; uncommon courage.
  Syn: -- Rare; scarce; infrequent; unwonted.
  -- Un*com*mon*ly, adv. -- Un*com*mon*ness, n.
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  uncommon
       adj 1: not common or ordinarily encountered; unusually great in
              amount or remarkable in character or kind; "uncommon
              birds"; "frost and floods are uncommon during these
              months"; "doing an uncommon amount of business"; "an
              uncommon liking for money"; "he owed his greatest debt
              to his mother's uncommon character and ability" [ant:
              common]
       2: marked by an uncommon quality; especially superlative or
          extreme of its kind; "what is so rare as a day in
          June"-J.R.Lowell; "a rare skill"; "an uncommon sense of
          humor"; "she was kind to an uncommon degree" [syn: rare]