MCMLXXXIX.I.XXXMCMLXXXIX.IX .XXV罗马数字是古罗马使用的数字系统,现今仍很常见.罗马数字元号 I- 1II - 2III - 3IV - 4V – 5VI - 6VII – 7VIII - 8IX - 9X – 10XI – 11XII – 12XIII – 13XIV – 14XV – 15XVI...