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rong cheng tian e hu
Author(s): 
Pages: 14
Year: Issue:  5
Journal: Ocean World

Abstract: <正> 提起天鹅,我们的眼前立刻浮现出美丽的图景:雪白的羽毛、优雅的体态、明亮的叫声、祥和温馨的氛围……。天鹅给我们带来了美妙的精神享受,可是大多数人没有福气亲眼看见它们。人们了解和认识它们大都在动物园或在电视节目上,很少有人能见到活生生的野生天鹅,因为它们的数量相对稀
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