21：twentyone 22：twentytwo 23：twentythree
24：twentyfour 25：twentyfive 26：twentysix
27：twentyseven 28：twentyeight 29：twentynine
30：thirty 以上是基数词下面是序数词,翻译成第多少多少(等号前面为缩写)：1st = first
2nd = second3rd=third4th=fourth5th=fifth6th=sixth7th=seventh8th=eighth9th=ninth10th=tenth11th=eleventh
12th=twelfth
13th=thirteenth
14th=fourteenth
15th=fifteenth
16th=sixteenth
17th=seventeenth
18th=eighteenth
19th=nineteenth
20th=twentieth
21st=twenty-first
22nd=twenty-second
23rd=twenty-third
24th=twenty-fourth
25th=twenty-fifth
26th=twenty-sixth
27th=twenty-seventh
28th=twenty-eighth
29th=twenty-ninth
30th=thirtieth以上希望有帮助,加油!