英语中1-30的序数词分别是什么?答:3)第21-第30:twenty-first, twenty-second, twenty-third, twenty-fourth, twenty-fifth, twenty-sixth, twenty-seventh, twenty-eighth, twenty-ninth, thirtieth 4)第31:thirty-first 英语中序数词的变化规律记忆口诀如下:1)1、2、3,单独记,(one—first, two—second, three—third)2)th...