英语基数词、序数词：1-15,20,25,30,35,40,45,50-55.

1.one,first; 2.two,second 3.three,third 4 four,fourth 5 five,fifth 6 six,sixth7 seven,seventh 8 eight eighth 9 nine ninth 10 ten tenth 11 eleven eleventh 12 twelve twelfth 13 thirteen thirteenth 14 fo...