up·stream /ˈʌpˈstrim/
(ad.)向上游,逆流地(a.)向上游的,逆流而上的
up·stream /ˈəpˈstrɪm/ 副詞 形容詞
逆流,上升氣流,上游區
upstream
上游
Up·stream adv. Toward the higher part of a stream; against the current.
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upstream
adj : in the direction against a stream's current [ant: downstream]
adv 1: toward the source or against the current [syn: upriver]
[ant: downriver, downriver]
2: against the current; "he swam upstream"