基本序数1-10
First, second, third, forth, fifth, sixth, seventh, eighth, ninth, tenth
11到19:数字+th 20: tewntieth
eleventh, twelfth, thirteenth, fourteenth, fifteenth, sixteenth, seventeenth, eighteenth, nineteenth, twentieth.
21-29:twenty+基本序数1-9 30: thirtieth
twenty-first, twenty-second, twenty-third, twenty-fourth, twenty-fifth, twenty-sixth, twenty-seventh, twenty- eighth, twenty-ninth, thirtieth.
31-39:thirty+基本序数1-9 40: fortieth
Thirty-first, thirty-second, thirty -third, thirty -fourth, thirty -fifth, thirty -sixth, thirty -seventh, thirty - eighth, thirty -ninth, fortieth.
41-49:forty+基本序数1-9 50: fiftieth
forty-first, forty -second, forty -third, forty -fourth, forty -fifth, forty –sixth, forty -seventh, forty - eighth, forty -ninth, fiftieth.
51-59:fifty+基本序数1-9 60: sixtieth
fifty-first, fifty -second, fifty -third, fifty -fourth, fifty -fifth, fifty –sixth, fifty -seventh, fifty - eighth, fifty -ninth, sixtieth.
61-69:sixty+基本序数1-9 70: seventieth
sixty-first, sixty -second, sixty -third, sixty -fourth, sixty -fifth, sixty –sixth, sixty -seventh, sixty - eighth, sixty -ninth, seventieth.
71-79:seventy+基本序数1-9 80: eightieth
seventy-first, seventy -second, seventy -third, seventy -fourth, seventy -fifth, seventy –sixth, seventy -seventh, seventy - eighth, seventy -ninth, eightieth.
81-89:eighty+基本序数1-9 90: ninetieth
eighty-first, eighty -second, eighty -third, eighty -fourth, eighty -fifth, eighty –sixth, eighty -seventh, eighty - eighth, eighty -ninth, ninetieth
91-99:ninety+基本序数1-9 100: one hundredth
ninety-first, ninety -second, ninety -third, ninety -fourth, ninety -fifth, ninety –sixth, ninety -seventh, ninety - eighth, ninety -ninth, one hundredth.
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