B.C. = Before Christ
A.D. = Latin phrase "anno domini" = "in the year of our Lord."
The purpose of the B.C. and A.D. was to make the birth of Jesus Christ the dividing point of world history.
B.C. = Before Christ 耶稣（诞生）之前-公元前
A. D. = Anno Domini （古拉丁文）公元
这样读，MS没了
传说中耶稣基督的生年为公历元年(相当于中国西汉平帝元年)
公元前BC公元AD
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