down·stream /ˈdaʊnˈstrim/
  (ad.)下游地(a.)下游的
  down·stream /ˌdaʊnˈstrɪm/ 副詞 形容詞
  下游區
  Down·stream adv. Down the stream; as, floating downstream.
  ◄ ►
  downstream
       adj : in the direction of a stream's current [ant: upstream]
       adv : away from the source or with the current [syn: downriver]
             [ant: upriver, upriver]