one（加箭头）first
two（加箭头）second
three（加箭头）third
four（加箭头）fourth
five（加箭头）fifth
twelve（加箭头）twelfth
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thirteen（加箭头）thirteenth
twenty（加箭头）twentieth
thirty（加箭头）thirtieth
forty（加箭头）fortieth
fifty（加箭头）fiftieth
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sixty（加箭头）sixtieth
twenty-one（加箭头）twenty-first
thirty-two（加箭头）thirty-second
forty-three（加箭头）forty-third
fifty-four（加箭头）fifty-fourth
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