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数词 1．基数词： 1－12 13－19 20－90 100－ 1 one 13 thirteen 20 twenty 100 a hundred 2 two 14 fourteen 21 twenty-one 300 three hundred 3 three 15 fifteen 22 twenty-two 1,000 a thousand 4 four 16 sixteen 30 thirty 5,000 five thousand 5 five 17 seventeen 40 forty 1,000,000 a million 6 six 18 eighteen 50 fifty 1,000,000,000 a billion 7 seven 19 nineteen 60 sixty 8 eight 70 seventy 9 nine 80 eighty 10 ten 90 ninety 11 eleven 12 twelve 2．序数词： 1-10 11-19 20-90 100- 1 first 1st 11 eleventh 11th 20 twentieth 20th 100 one hundredth 100th 2 second 2nd 12 twelfth 12th 21 twenty-first 21st 103 one hundred and third 103rd 3 third 3rd 13 thirteenth 13th 30 thirtieth 30th 134 one hundred and thirty-fourth 134th 4 fourth 4th 14 fourteenth 14th 37 thirty-seventh 37th 200 two hundredth 200th 5 fifth 5th 15 fifteenth 15th 40 fortieth 40th 1000 one thousandth 1,000th 6 sixth 6th 16 sixteenth 16th 50 fiftieth 50th 1,000,000 one millionth 1,000,000th 7 seventh 7th 17 seventeenth 17th 60 sixtieth 60th 1,000,000,000 one billionth 1,000,000,000th | 
