go after
  追趕,追求
  go after
       v 1: go after with the intent to catch; "The policeman chased the
            mugger down the alley"; "the dog chased the rabbit"
            [syn: chase, chase after, trail, tail, tag, give
            chase, dog, track]
       2: go in search of or hunt for; "pursue a hobby" [syn: quest
          for, quest after, pursue]