哦,最长的单字是pneumonoultramicroscopicsilicovolcanoconiosis,由45个字母组成,意思应该是一种肺部疾病矽肺病。祝你学习进步哈，基数词变序数词的口诀:基变序,有规律,词尾加上-th，一,二,三,特殊记,词尾字母t,d,d，八去t,九除e,ve要用f替,ty将y变成i,th前面有个e。
nine:num。复数:nines例句:Afurthernineapplicationsarebundledwiththesystem。该系统免费附送九套应用软件。een90ninety4four14fourteen40forty序数词fourth(4th)第四fourteenth(14th)第十四fortieth(40th)第四十ninth(9th。
one,two,three,four,five,six,seven,eight,nine,ten,12345678910eleven,twleve,thirteen,forteen,fifteen,sixteen。one,two,three,four,five,six,seven,eight,nine,ten,12345678910eleven,twleve,thirteen,forteen,fifteen,sixteen,seventeen,eighteen。