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1·He retired in 1970, on his fiftieth birthday.

他在1970年50岁生日时退休。《柯林斯英汉双解大词典》

2·He was stricken by a heart attack on his fiftieth birthday.

他在五十岁生日那天心脏病发作。《牛津词典》

3·The fiftieth World Environment Day was on June 5th, 2021.

2021年6月5日是第五十个世界环境日。

4·Today is my fiftieth birthday, but I look like a person of eighty-five.

今天是我的五十岁生日，但我看起来像一个八十五岁的人。

5·2009 marks the fiftieth anniversary of Hawaii's statehood.

2009年是夏威宜加入美国成为第五十个州的五十周年之际。

6·It doesn't matter tomorrow if they come in first or fiftieth.

他们明天得第一名还是第五十名都不重要。

7·We were at a friend's fiftieth birthday party in Mexico.

我们去墨西哥参加朋友的50岁生日聚会。

8·A golden wedding is the fiftieth anniversary of a marriage.

金婚是结婚五十周年纪念日。

9·This new method was brought into existence in the fiftieth.

这一新方法出现于五十年代。

10·This week marks the fiftieth anniversary of the Peace Corps.

本周是和平队成立五十周年。