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。

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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。

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This new method was brought into existence in the fiftieth.

这一新方法出现于五十年代。

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The day marked the fiftieth anniversary of American women gaining the right to vote.

VOA: special.2009.10.18

Now, if we have any doubts that On the Road is mythic in itself, I just want to show you quickly two things. In 2007, On the Road had its fiftieth anniversary of publication.

现在如果还有对这本小说虚构性有所疑问，我想要迅速地让向你们展示两件事情，2007年是《在路上》出版的十五周年。

耶鲁公开课 - 1945年后的美国小说课程节选

Hawaiians accepted it, and on August twenty-first, President Eisenhower declared Hawaii the fiftieth state.

VOA: special.2009.03.02

This week is the fiftieth anniversary of the publication of the book, The Feminine Mystique.

FORBES: On The 50th Anniversary of 'The Feminine Mystique,' Is There Still A 'Problem That Has No Name?'

Republicans who were in the fiftieth percentile gave the right answer more often than those in the ninety-fifth percentile.

NEWYORKER: Unpopular Mandate

Mr Brown said the fund would be established next year to honour the fiftieth anniversary of the accession of Queen Elizabeth.

BBC: Britain announced Commonwealth education fund