Predators like the smallmouth bass have caused problems for the upper river's environment.

像小嘴鲈鱼这样的掠食者已经给科罗拉多河上游的环境造成了问题。

But you, dear neighbour; it seems to me stranger that you should know the upper river, than that I should not know it; for, as I understand, you have only been in England a few days.

但是你，亲爱的邻居；在我看来，你知道上游河比我不知道它更奇怪；因为，据我所知，你到英国才几天。