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1公元纪年法现行的公元纪年法是从耶稣出生之年算起,这一年以前的年份叫公元前某年,以后的年份叫公元某年.但应该注意,没有公元0年这一年.我国是从1949年中华人民共和国成立之后采用公元纪年的,比如今年是公元2017年(可简记为2017年).因为没有公元0年,所以本文把公元前1,2,3,…,n,…年分别记作公元0,-1,-2,…,1-n,…年.因而,在下文中的公元n(n∈Z)年中都有意义.
1 AD Chronicle The current AD Chronology dates from the year of Jesus’ birth, the year before that year is called BC, and the year after that is called the year BC But it should be noted that there is no year 0 AD. Our country adopted the AD from the founding of the People’s Republic of China in 1949. For example, this year is 2017 (abbreviated as 2017). Since there was no AD 0 years, , ..., are denoted as years 0, -1, -2, ..., 1-n, ..., respectively, thus making sense in the year AD n (n∈Z) below.