ex·trin·sic /ɛkˈstrɪnzɪk, ˈstrɪn(t)sɪk/
  (a.)外在的,外來的,外表的
  ex·trin·sic /ɛkˈstrɪnzɪk, ˈstrɪn(t)sɪk/ 形容詞
  外,外部的,外在的
  Ex·trin·sic a.
  1. Not contained in or belonging to a body; external; outward; unessential; -- opposed to intrinsic.
     The extrinsic aids of education and of artificial culture.   --I. Taylor.
  2. Anat. Attached partly to an organ or limb and partly to some other part; -- said of certain groups of muscles. Opposed to intrinsic.
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  extrinsic
       adj : not forming an essential part of a thing or arising or
             originating from the outside; "extrinsic evidence"; "an
             extrinsic feature of the new building"; "that style is
             something extrinsic to the subject"; "looking for
             extrinsic aid" [ant: intrinsic]