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Factory wastewater has to be cleaned before it goes back to nature.

工厂废水在回归自然之前必须进行净化。

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He used to return home at least once a year, but hasn't been back for almost three years now because of the hard job in a crayon factory.

他过去每年至少回家一次，但由于在蜡笔厂工作太辛苦，他已经快三年没回家了。

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Today, the hapless youngster innocently applied webOS Doctor in a bid to reset his phone back to factory and wouldn't ya know it?

ENGADGET: Palm webOS 1.2 leaked, plugged in record time

And they will often decide to go back to a different factory: or not to go back at all having done their few years and made their nest egg.

FORBES: Foxconn's Hiring: There Must Be A New Apple iPhone On The Way

Sometimes manufacturers don't learn of a quality issue until after a customer goes to the dealer with a complaint and the dealer ships the faulty part back to the factory.

FORBES: Big Mechanic Is Watching