前为基数词，后为序数词
1:one first
2:two second
3:three third
4:four fourth
5:five fifth
6:six sixth
7:seven seventh
8:eight eighth
9:nine ninth
10:ten tenth
11:eleven eleventh
12:twelve twelfth
13:thirteen thirteenth
14:fourteen fourteenth
15:fifteen fifteenth
16:sixteen sixteenth
17:seventeen seventeenth
18:eighteen eigteenth
19:nineteen nineteenth
20:twenty twentieth
21:twenty-one twenty-first
22:twenty-two twenty-second
23:twenty-three twenty-third
24:twenty-four twenty-fourth
25:twenty-five twenty-fifth
26:twenty-six twenty-sixth
27:twenty-seven twenty-seventh
28:twenty-eight twenty-eighth
29:twenty-nine twenty-ninth
30:thirty thirtieth
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