目前,有不少人认为21世纪是从2000年开始.其实这是不正确的.序数都是从“1”开始,而不是从“0”开始.公元计数并没有“零世纪”,也没有公元零年.第一世 At present, many people think that the 21st century will begin in 2000. In fact, this is incorrect. The ordinal numbers start from “1” instead of starting from “0.” There is no “zero century” in the counting of the dynasties nor AD 0 years. The first world