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The seventieth item in a series is the one that you count as number seventy.
the seventieth anniversary of the discovery of Tutankhamun's tomb.
图坦卡蒙墓发现70周年纪念日。
seventieths
A seventieth is one of seventy equal parts of something.
雅思英语词汇收录8785个雅思英语词条，基本涵盖了全部常用雅思英语词汇的翻译及释义，是英语学习的有利工具。