名词 waterfowl:

1. freshwater aquatic bird

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1. Some water birds skittered over the lake.
   几只水鸟飞掠过了湖面。
2. A great number of water fowls dwell on the island.
   许多水鸟在岛上栖息。
3. Naturalists are concerned that diminishing wetlands are leading the water birds to overpopulate this refuge.
   自然主义者博物学家担心，逐渐减少湿地是第一位的对水禽的影响，形成人口过密的避难所。