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You use BC in dates to indicate a number of years or centuries before the year in which Jesus Christ is believed to have been born. Compare AD.
The brooch dates back to the fourth century BC.
这枚胸针可追溯至公元前4世纪。
雅思英语词汇收录8785个雅思英语词条，基本涵盖了全部常用雅思英语词汇的翻译及释义，是英语学习的有利工具。