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da er wen de jin hua shu wu dao lu di shang qu chan luan
Author(s): 
Pages: 90-93
Year: Issue:  5
Journal: China Three Gorges Construction

Abstract: 了解了这些现存四足动物的事实,我们就可以重回到3.4亿年前,再来问这样一个问题:为什么四足动物来到了陆地上?
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