1到20的英语序数词
1）序数词第一至第二十的数字为:
first (1st)
second (2nd)
third (3rd)
fourth (4th)
fifth (5th)
sixth (6th)
seventh (7th)
eighth (8th)
ninth (9th)
tenth (10th)
eleventh (11th)
twelfth(12th)
thirteenth (13th)
fourteen (14th)
fifteenth (15th)
sixteenth (16th) seventeen (17th)
eighteenth (18th)
nineteenth (19th)
twentieth (20th)
注：英语序数词第1-19除了first、 second、 third 有特殊形式外，其余均由基数词加后缀-th 构成。
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