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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。

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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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He has been working on Mars Day for four years.

VOA: special.2010.07.28

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

Democrats say they'll have 250, 000 volunteers working in battleground states on Election Day -- nearly three times the number working for Al Gore four years ago.

CNN: Ground war: Getting out the vote

Oscar-winning director Ang Lee has reportedly pulled out of his first TV project, because he needs "some rest", after spending over four years working on Life of Pi.

BBC: Ang Lee 'pulls out of FX TV project Tyrant to rest'