第二十:twentieth;
第三十: thirtieth;
第四十: fortieth;
第五十:fiftieth;
第六十: sixtieth;
第七十: seventieth;
第八十 :eightieth;
第九十 : ninetieth;
1 - one
2 - two
3 - three
4 - four
5 - five
6 - six
7 - seven
8 - eight
9 - nine
10 - ten
11 - eleven
12 - twelve
13 - thirteen
14 - fourteen
15 - fifteen
16 - sixteen
17 - seventeen
18 - eighteen
19 - nineteen
20 - twenty
21 - twenty-one
22 - twenty-two
23 - twenty-three
24 - twenty-four
25 - twenty-five
26 - twenty-six
27 - twenty-seven
28 - twenty-eight
29 - twenty-nine
30 - thirty
40 - forty
50 - fifty
60 - sixty
70 - seventy
80 - eighty
90 - ninety
100 - one hundred
参考资料
作业帮:https://www.zybang.com/question/5db19b8f90ec2717cdd96fdf99ca25a0.html
twenty,thirty,forty,fifty,sixty,seventy,eighty,ninety
one