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BC.bi:5si:abbreviation for Before Christ (used in the Christian CALENDAR when referring to a year before Jesus Christ was born)公元前Dinosaurs became extinct 62 million years BC.恐龙在公元前6200万年绝种。The Battle of Actium took place in 31 BC.海岩群落战役发生于公元前31年。 ☆ AD Dates
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