top-down /ˈtɑpˈdaʊn/
  自頂而下
  top-down
  自上而下
  top-down
       adj : of an approach to a problem that begins  at the highest
             conceptual level and works down to the details; "a
             top-down analysis might begin by looking at
             macro-economic trends"; "top-down programming" [ant: bottom-up]