This process requires a huge amount of manual labor; it is tedious, difficult, and very error prone.

这个过程需要大量的人力，并且是冗长、困难，且非常容易出错的。

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Not only does the lack of laundry mean cleaner water, it means that people can be spared hours of tedious, backbreaking labor.

FORBES: Nanotechnology May Lead To The End Of Laundry