1 first
2 second
3 third
4 fourth
5 fifth
6 sixth
7 seventh
8 eighth
9 ninth
10 tenth
11 eleventh
12 twelfth
.
.
.
.
如此类推
20 twentieth
21 twenty-first
22 twenty-second
23 twenty-third
24 twenty-fourth
30 thirtieth
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