If the trees were all removed, there would be nothing holding back this dirt from our rivers, destroying the aquatic environment. 如果把树木全部移走，那么就没有什么能够防止碎石进入我们的河流，破坏水生环境。
These mechanisms, part of the marine mammal diving response, are adaptations to living in an aquatic environment and help during the process of sleeping. 这些机制作为部分海洋动物潜水的反应，是对在水生环境中生活的适应，并有助于睡眠。
