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da guan yuan
Author(s): 
Pages: 35
Year: Issue:  9
Journal: Required Reading for Junior Middle School Students

Abstract: <正>130亿年前的宇宙爆炸美国天文学家观测到了发生于可见宇宙最边缘的一次星体爆炸,它发生在130亿年前。聪明糖衣科学家发明了一种
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