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I went through my midlife crisis about four or five years ago, when I was forty.

在我40岁时，我经历了中年危机。

《柯林斯英汉双解大词典》

Menstruation may cease when a woman is anywhere between forty-five and fifty years of age.

月经可能在女性45至50岁之间停止。

《柯林斯英汉双解大词典》

President Obama has signed legislation to make the biggest changes in the health care system in forty-five years.

VOA: special.2010.03.24

Back in the 1840s, life insurance was very important because the average expectancy of life was only something like forty-five years, so that meant parents were dying left and right.

在19世纪40年代的时候,寿险是非常重要的,因为当时的人均期望寿命,仅为45岁左右,这意味着双亲平均只能活到45岁

耶鲁公开课 - 金融市场课程节选

NASA said its astronaut candidates had to be between twenty-five and forty years old and in excellent health.

VOA: special.2009.06.10

Forty-five years later the theater of war has shifted to Afghanistan, but the same mechanics are in play.

CNN: Review: 'Iron Man' packs a terrific punch

Forty-five years ago, when you had a gold standard, all I had to do was value stocks and commodities.

FORBES: An Interview With Mr. Markets About The Past Week's Turbulence

Forty-five years ago, we made a solemn compact as a nation that senior citizens would not go without the health care they need.

WHITEHOUSE: Weekly Address: Medicare Officially Safer After Health Reform | The White House