问题描述: first 的缩写怎么输入 1个回答 分类:综合 2014-12-03 问题解答: 我来补答 序数词缩写如1st 2nd 3rd 4th 5th...20th 那么第21,22,23,31,32,33...等应该写成21st,22nd,23rd,还是写成21th,22th,23th. 展开全文阅读