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zuo : bi kong long huan lao de hai yu
Author(s): 
Pages: 40
Year: Issue:  7
Journal: Ocean World

Abstract: <正> 外表的色彩是棕色的,长相既像虾又像蟹,所以人们又称鲎为“马蹄蟹”。它是和三叶虫(现在只有化石)一样古老的动物。鲎的祖先出现在地质
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