问题标题：
【英语序数词20-31】
问题描述：
英语序数词20-31
皋磊回答：
twenty---twentieth
twenty-one---twenty-first
twenty-two---twenty-second
twenty-three---twenty-third
twenty-four---twenty-fourth
twenty-five---twenty-fifth
twenty-six---twenty-sixth
twenty-seven---twenty-seventh
twenty-eight---twenty-eighth
twenty-nine---twenty-ninth
thirty---thirtieth
thirty-one---thirty-first
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