都不对,2的基数词是two,序数词是2nd。表达一个人两岁了,可以说He/She is two years old.可以简写为He/She is two.two英[tuː]美[tuː]num.二。[例句]Two out of three people think the President should resign.有三分之二的人认为总统应当辞职。[其他]复数:twos。序数词的缩写有时,序数词可以用缩写形式来表示。主要缩写形式有:1-10:first、second、third、fourth、fifth、sixth、seventh、eighth、ninth、tenth。11-20:eleventh、twelfth、thirteenth、fourteenth、fifteenth、sixteenth、seventeenth、eighteenth、nineteenth、twentieth。21-30:twenty-first、twenty-second、twenty-third、twenty-fourth、twenty-fifth、twenty-sixth、twenty-seventh、twenty-eighth、twenty-ninth、thirtieth。其中1st,2nd,3rd为特殊形式,其它的都是阿拉伯数字后加th。(以1,2,3结尾是st,nd,rd。eg:twenty-first—21st)