• 1. the eightieth: 第八十
• 2. the eightieth Annountement: 国家知识产权局第80号公告

• 1.Next October will mark the eightieth anniversary of what is generally considered the beginnings of the Depression.
  下个十月大致上可以被认定为大萧条的开始。
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• 2.I hope you have a mother's eightieth birthday. May the mother in the New Year, happy everyday, day by day with laughter.
  祝母亲的八十岁生日，愿母亲在新的一年中，天天都愉快，日日有笑声。
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