华东师范大学出版社《中国历史》七年级上册第133页有一个夏朝至南北朝历史年表的年代标尺,在此我截取了其中的一段,如下: 600 500 400 300 200 100 0 100 200 300 400 500 600 在使用这个年代标尺时,我们发现上面出现了“0”这个年代。众所周知,我国现在采用的纪年法是世界通用的公元纪年法,它以公元元年作为纪年的标志,在这以前,称为公元前××年;在这以后,称 The East China Normal University Press “Chinese History” seventh grade book page 133 has a chronological scale of the Xia and Northern and Southern Dynasties chronology. Here I cut one of them, as follows: 600 500 400 300 200 100 0 100 200 300 400 500 600 When using this age scale, we found that there was an era of “0” above. As is known to all, the year-by-year law adopted by our country is the universal year-round method of the AD. It uses the first year of the year as a mark of the chronological year. Until then, it was called the BC BC; after that, it was called