十二的基数词 20的基数词,序数词

基数词 序数词 1 one first2 two second3 three third4 four fourth5 five fifth6 six sixth7 seven seventh8 eight eighth9 nine ninth 10 ten tenth11 eleven eleventh12 twelve twelfth13 thirteen thirteenth14 fourteen fourteenth15 fifteen fifteenth16 sixteen sixteenth17 seventeen seventeenth18 eighteen eighteenth19 nineteen nineteenth20 twenty twentieth