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修复bug:在春节前一日无法判断为前一年,因而导致错误
优化:将 f-字符串 的使用改为 .format() ,兼容更早的Python3版本
优化:将中文年份表达中的“零”改为“〇”
优化:将中文日期表达中的“二十”改为“廿”
优化:新增注释
优化:常量(数据)内容与转换库分离