the big bang theory
noun [ S ] astronomy specialized uk/ˌbɪɡ ˈbæŋ ˌθɪə.ri/ us/ˌbɪɡ ˈbæŋ ˌθi.ə.ri/
（宇宙创世）大爆炸理论
the theory that the universe began with a very large explosion of a single mass of matter
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