序数词简写不一样，一直以为都是数字后加 th 。
The 22nd Tokyo International Film Festival
The 14th Pusan International Film Festival
原来不光是 th，还有加 nd 的，重记一下序数词。
| 第一 | first | 1st |
| 第二 | second | 2nd |
| 第三 | third | 3rd |
| 第四 | fourth | 4th |
| 第五 | fifth | 5th |
| 第六 | sixth | 6th |
| 第七 | seventh | 7th |
| 第八 | eighth | 8th |
| 第九 | ninth | 9th |
| 第十 | tenth | 10th |
| 第十一 | eleventh | 11th |
| 第十二 | twelfth | 12th |
| 第十三 | thirteenth | 13th |
| 第十四 | fourteenth | 14th |
| 第十五 | fifteenth | 15th |
| 第十六 | sixteenth | 16th |
| 第十七 | seventeenth | 17th |
| 第十八 | eighteenth | 18th |
| 第十九 | nineteenth | 19th |
| 第二十 | twentieth | 20th |
| 第二十一 | twentieth-first | 21st |
| 第二十二 | twentieth-second | 22nd |
| 第二十三 | twentieth-third | 23rd |
| 第二十四 | twentieth-fourth | 24th |
除第11、第12、第13，数字后加 th 外，逢1，2，3都是加 st 、nd 、rd，如此类推：
1st 2nd 3rd ... 4th 5th 6th 7th ... 20th
21st 22nd 23rd ... 24th 25th ... 30th
31st 32nd 33rd ... 34th 35th ... 40th