sofa上的猫
1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th, 9th, 10th, 11th, 12th, 13th, 14th, 15th, 16th, 17th,18th, 19th, 20th, 21st, 22nd, 23rd, 24th, 25th, 26th, 27th, 28th, 29th, 30th.20以后就是拿20的加上第1到第9就是twenty-first ，后面到29以此类推31为thirty-first ，直到39以此类推41为 forty-first ，后面同上50为fiftieth；第1、2、3是例外，第1-1st第2-2nd第3-3rd第四以后都是数字加th，比如4th,5th，但从20以后如果遇到个位数为1、2、3的还得按照1st、2nd和3rd来写，比如第32为32nd。
