“向上游”用英语怎么说？

水位涨得够高了，他们可以继续向上游航行。The water rose high enough for them to continue upstream.这艘船顺尼罗河向上游航行.The ship is sailing up the Nile.探险者们谨慎地把独木舟向上游划去.The explorers paddled their canoe cautiously upstream....