基数词twenty 20thirty. 30forty. 40fifty. 50sixty. 60seventy. 70eighty. 80ninety. 90序数次twentieth 20序数词变y为ie 加th
基数词twenty 20thirty. 30forty. 40fifty. 50sixty. 60seventy. 70eighty. 80ninety. 90序数次twentieth 20序数词变y为ie 加th
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