crack·er·jack /ˈkrækɚ/
  (a.)能乾的[人] ;傑出的
  Crack·er·jack n. [also spelled crackerjack.]
  1. An individual of marked ability or excellence, esp. in some sport; as, he is a crackajack at tennis. [Slang]
  Syn: -- jimdandy, jimhickey.
  2.  A preparation of popped corn, candied and pressed into small cakes.  The name Cracker Jack(TM) is now a trademark for a similar confection. [U. S.]
  Crack·a·jack n. [Now usually spelled crackerjack.]
  1. An individual of marked ability or excellence, esp. in some sport; as, he is a crackajack at tennis. [Slang]
  2.  A preparation of popped corn, candied and pressed into small cakes. [U. S.]
  Crack·a·jack, a. [Now usually spelled crackerjack.] Of marked ability or excellence. [Slang]
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  Crack·er·jack, a. [also spelled crackajack.] Of marked ability or excellence. [Slang]
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  crackerjack
       n 1: someone excellent of their kind; "he's a jimdandy of a
            soldier" [syn: jimdandy, jimhickey]
       2: something excellent of its kind; "the bike was a jimdandy"
          [syn: jimdandy, jimhickey]