基数词和序数词的规律

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  • 4: forty前是four
    four fourth
    fourteen fourteenth
  • 9: ninth, 其他都是nine
    nine
    nineteen nineteenth
    ninety ninetieth
  • 5: five外 -> fif
    fifth
    fifteen fifteenth
    fifty fiftieth
  • 3: three外 -> thir
    third
    thirteen thirteenth
    thirty thirtieth

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