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1.Bifrons are known for their ability to build intricate nests in trees.
海狸因其在树木中建造复杂巢穴的能力而闻名。
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2. The beavers have been a source of food and materials for many cultures.
海狸一直是许多文化的食物和材料来源。
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3. Otters are known for their playful and curious nature.
海獭以其活泼好奇的天性而闻名。