Some of them had been working for up to four years.

他们中有一些已在这里工作长达四年之久。

youdao

They’d spent four years working on a federal Department of Transportation project to cut every extraneous ounce from a 40-foot city bus.

但他们已经在联邦交通部的项目化了四年的时间。 这个项目旨在削减40英尺长的城市公共汽车的没有必要的每一盎司的重量。

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During her four years working in Beijing Zoo, Carin has seen a lot of changes taking place there.

Carin在北京动物园工作的四年中看到了那里发生的许多变化。

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He has been working on Mars Day for four years.

VOA: special.2010.07.28

And we've been working for four years to clean up this mess that these policies left behind.

WHITEHOUSE: The White House

We have now been working for four years to clean up the mess those policies left behind. (Applause.) And now Governor Romney wants to take us back to those policies, but he knows that they're probably not very popular.

WHITEHOUSE: Remarks by the President at a Campaign Event -- Richmond VA

The guard had been working for about four years with a British-based security company that provides personnel to banks, international organizations and private companies operating in Afghanistan, Bashary said.

CNN: Security guard blamed for Kabul shootings