基数词
1 one 
2 two 
3 three 
4 four 
5five
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
22twenty- two 
23twenty- three
24 twenty - four
25 twenty -five
28 twenty - eight 
29 twenty - nine
30 thirty
31 thirty - one
序数词
1first    
2 second    
3third
4fourth 
5 fifth         
6 sixth 
7 seventh  
8 eighth   
9 ninth
10 tenth   
11 eleventh  
12 twelfth 
13 thirteenth 
14 fourteenth           
15 fifteenth  
16sixteenth 
17seventeenth   
18 eighteenth     
19nineteenth  
20 twentieth 
21 twenty - first
22 twenty - second 
23 twenty - third 
24 twenty - fourth 
25 twenty - fifth 
26 twenty - sixth 
27 twenty - seventh 
28 twenty - eighth 
29 twenty - ninth 
30 thirtieth 
31 thirty - first 
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