He worked as a teacher for 50 years.

他从事教师工作50年了。

《柯林斯英汉双解大词典》

The volcano has been inactive for 50 years.

这座火山处于休眠状态50年了。

《牛津词典》

He's been doing the same job for 50 years—man and boy.

他从小就干着同一份工作，有50年了。

《牛津词典》

"The policy we have had in place for 50 years has not worked the way we wanted it to,"

VOA: standard.2009.04.19

If only you'd known you were only going to have 20 more years instead of 50 more years, you would've picked a different kind of life for yourself.

如果你知道你只剩下,20年而不是50年，你就会为自己选择另一种生活。

耶鲁公开课 - 死亡课程节选

They eliminated entire bus lines that had been there for like 50, 60 years.

他们取消了已经存在了五六十年的整条巴士线路。

纽约的公共交通 - SpeakingMax英语口语达人

Economists have debated this for 50 years, beginning with a paper by Arnold C.

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No sense buying a recent comic book and preserving it in a vault for 50 years.

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For 50 years, the Pap test has been the gold standard for detecting cervical cancer.

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