一至20的英语,第一到第20的英语怎么拼?

one two three four five six seven eight nine ten eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen twenty
first second third fourth fifth sixth seventh eighth nineth tenth eleventh twelfth thirteenth fourteenth fifteenth sixteenth seventeenth eighteenth nineteenth twentieth

one two three four five six seven eight nine ten eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen twenty
呃.原来是"第"啊...
3楼的正解咯

楼上加first,second,third,fourth,fifth,sixth,seventh,eighth
ninth,tenth,eleventh,twelfth,thirteenth，fourth,fifteenth,sixteenth,seventeenth,eighteenth,nineteenth,
twentieth