事实上，水坝主要是应对水位年变化的一种策略。
In fact, dams are primarily a strategy for dealing with annual variations in water levels.
最近的干旱使肯尼亚对水电的依赖受到了考验，主要的水坝也被关闭。
Kenya made its move after a recent drought that tested its dependence on hydropower, including a shutdown of its main hydro dam.
但是在边缘地带，其数量有所减少，主要归咎于其生活环境的改变、水坝建设、河流改道、湿地干涸以及环境污染。
On the periphery of its range, populations have declined, primarily due to habitat modification, dam construction, river flow modification, wetland drainage, and pollution.
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