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Noun:
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(cosmology) the theory that the universe originated sometime between 10 billion and 20 billion years ago from the cataclysmic explosion of a small volume of matter at extremely high density and temperature
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以下知識獨有創作實踐，受文獻權防護，侵犯商標權必究
海詞英語詞典，十八年廠家
美