复数： eightieths

I saw him at his eightieth birthday party .

我在他80岁的生日宴会上看到过他。

This year we 'll celebrate our mother 's eightieth birthday .

今年，我们将庆祝母亲80岁生日。

We are going to celebrate his eightieth birthday .

我们打算庆祝他八十大寿．

Our program today is about the eightieth anniversary of the anchorage-to-nome dog sled race .

我们今天的节目是关于安克雷奇------诺姆狗雪橇赛80周年纪念日的.

Next october will mark the eightieth anniversary of what is generally considered the beginnings of the depression .

明年十月将标志着一般认为是大萧条初期的80周年纪念日。