英文 1st 2nd 3rd

题目

英文 1st 2nd 3rd
为甚麼11不是st而是th 12为甚麼不是nd而是th 13为甚麼不是rd而是th?
那21又用st 22用nd 23rd呢?

答案

11 - eleven eleventh
12 - twelve twelfth
13 - thirteen thirteenth
21 - twenty-one twenty-first
22 - twenty-two twenty-second
23 - twenty-three twenty-third