When some sea otter populations off the Alaskan coast started rapidly declining a few years ago, it caused much concern because sea otters play an important ecological role in the coastal ecosystem.
几年前，阿拉斯加海岸的海獭数量急剧减少。由于海獭对于维持海岸沿线生态平衡有非常重要的作用，所以其数量下降引起了广泛的关注。
Currently many fish populations in Trias waters are declining, a situation blamed on pollution.
当前Tria水域的很多种鱼类数量都在下降，这种现象被认为是污染造成的。
Currently many fish populations in Trias waters are declining, a situation blamed on pollution.
当前Tria水域的很多种鱼类数量都在下降，这种现象被认为是污染造成的。
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