spring·board /ˈsprɪŋˌbord, ˌbɔrd/
  跳板
  Spring·board n. An elastic board, secured at the ends, or at one end, often by elastic supports, used in performing feats of agility or in exercising.
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  springboard
       n 1: a flexible board for jumping upward
       2: a beginning from which an enterprise is launched; "he uses
          other people's ideas as a springboard for his own";
          "reality provides the jumping-off point for his
          illusions"; "the point of departure of international
          comparison cannot be an institution but must be the
          function it carries out" [syn: jumping-off point, point
          of departure]