hit-and-run /-ˈrʌn/
  (a.)打了就跑的
  hit-and-run
       adj 1: designed for or consisting of a brief attack followed by a
              quick escape; "hit-and-run units"; "tip-and-run
              assaults" [syn: tip-and-run]
       2: involving a driver of a motor vehicle who leaves the scene
          of an accident [syn: hit-and-run(a)]