B.C. and A.D.

B.C. VS A.D. Our calendar is based on the birth of Christ; all years before Christ's birth have traditionally been designated B.C. (before Christ) and those after his birth as A.D., an abbreviation for the Latin term anno Domini which means "in the year of the Lord." http://www.studentsfriend.com/feed/topic11.html

塔西佗(Publius Cornelius Tacitus) 塔西佗(Tacitus，约A.D.55～120年)是古代罗马最伟大的历史学家，他继承并发展了李维的史学传统和成就， 在罗马史学上的地位犹如修昔底德在希腊史学上的地位。