基数词：one, two, three, four, five, six, seven, eight, nine , ten , eleven , twelve , thirteen , fourteen , fifteen , sixteen , seventeen eighteen nineteen twenty twenty-one twenty-two twenty-three twenty-four twenty-five twenty-six twenty-seven twenty-eight twentynine thirty 序数词：first second third fourth fifth sixth seventh eighth ninth tenth eleventh twelfth thirteenth fourteenth fifteenth sixteenth seventeenth eighteenth nineteenth twentiethtwenty firsttwenty secondtwenty thirdtwenty fourthtwenty fifthtwenty sixthtwenty seventhtwentyeighth twentyninth thirtieth 本文来源：https://www.wddqw.com/doc/e1dc8161a02d7375a417866fb84ae45c3a35c205.html