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1、不好意思，上面那位仁兄，第十一。
2、第十二，第二十三错了，应该是：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 31st这个绝对没问题。
3、 第十一，第十二，第十三分别是：eleventh, twelfth,thirteenth,所以结尾用th, 第二十一。
4、第二十二，第二十三分别是：twenty-first, twenty-second, twenty-third,所以后面分别用st, nd, rd.。
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