AD (anno domini)
含义:公元后,
需要写在年数之前

BC (Before Christ)
含义:公元前
需要写在年数之后

例:
AD 2001
478 BC

另外:
BCE (before common era) = AD
CE (common era) = BC
都写在年数之后

例:
2001 CE
478 BCE

ref:
http://www.grammar-monster.com/lessons/abbreviations_AD_BC_BCE_CE.htm

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